US2522348A - Electronic amplifier - Google Patents
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- US2522348A US2522348A US39016A US3901648A US2522348A US 2522348 A US2522348 A US 2522348A US 39016 A US39016 A US 39016A US 3901648 A US3901648 A US 3901648A US 2522348 A US2522348 A US 2522348A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/52—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of gas-filled tubes
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- Another:V object. of the .invention is 'ato .i provide an improved .type lof thyratron amplifierfin'iwhich the plate vsupply voltage may beftaken .directly fromat voltage supplyline of con'imercial-fre- .quency and amplitude.
- Another object of the invention is to providel an improved type of thyratron'arplier Whereinfthe ciruit. y I l ,h advantage derived/from"thistypeofnjlifier construction that the electronflow'between the control "grid'and c'atho'd'e ofthetiiyratrh is ⁇ greatly reduced,
- AAnother vadvantage isthe' stabilization of the control point of the'thyratron because ofitlieA low impedance inputthereto.
- Another object is to provide a cathodefollowe'r circuit wherein-a voltagel to energize a lpreceding circuit is f obtained -frornfthat potential across the cathode follower resstance.
- ⁇ Another object f the invention is to provide' a to*H electronic taipiihers 51ooiaims.
- (cierre-35m .”,typesfinlwhicl'ithe resistance of the element .varies vviwth ther rlativefhumidity ,of the surrounding iriefdiii'ifn.' u Y. fl' I ',Tl'i felement" fl! .controlsfthefinput voltage.. applied to .an -electron...discharge 'device'.
- a cathdefZSand aiilament 21 Oheterrninal ofthe .element ill-is connected Vseries with a condenser -I Il.. and grid current initirig*resistorfffzto'the grid. 22. The' terminal .of 'elerneht"I Ulis connectedthrough' .”vdii'cton fifi. and ag"resistor,'521i ⁇ to 'the 'cathode 23.
- the .r'esis'toifi#A has a sliderZG cooperating'therewith v.to form a ⁇ potentiometer, v.the .slider .26. being f 'c"onn'ectedLtlfiroughyy 'a' r ⁇ esistor2 5. to the, .-gridterrefinar'fijtiie.girilimitingresisterlsz.'- 1..
- "white e"91 is connecter-11h51, conductors priniaryid.. andas'econ'darBd Vhas its secondary vcathode follower circuit utilizing regenerative "feedback by'means 'of a connection from the cath- .ode follower resistor tofthe. grid of 'the tube 'in "the'cathodefllo'we stage.
- Figure 1 shows acircuit embodying vthe pre- - ⁇ ierred modification ofthe invention
- Figure v2 shows .a modication 'ofthe .invention ernplo'ying'aA 'differentrneans of controllingthe input voltage. y y
- the humidity responsive resistance ID, condenser II, grid current limiting resistor I2 and resistance 25 are placed across that portion of resistance 24 between the slider 23 and conductor 54 and receives a potential therefrom.
- the type of relative humidity responsive re'- sistance element used in this circuit is one utilizing a salt solution such as is described in the Dunmore Patent 2,285,421 though it is understood that other types of humidity responsive resistl ance elements can be used. Because a salt solution type of relative humidity responsive resistance is used it is necessary to place a condenser in series therewith to block the direct 'current and prevent the rapid disintegration of thesalt shifting network intended to aidxin eliminating any chattering tendency of the relay ln the thyratron output circuit.
- a condenser 4I is placed inparallel with relay winding 40 to smooth out the current flowing through winding 40 and further aid in eliJninating any tendency of the relay winding to chatter.
- Both transformer primary 44 and transformer Y, secondary 34 are tied to power source lead i). This'makes it possible to energize both ⁇ tubes and the filament transformer from the same source while making use of only one trans- .former witha single secondary winding.
- ] is connected across the transformer secondary 34 through leads 28, 54, and 29.
- Filament 31 of thyratron 30 is connected across transformer secondary 34 by leads 33 and 39.
- Figure 2 shows a circuit employing a different means of controlling the input voltage.
- FIG. 2 The overallcircuit in Figure 2 is very similar to that in Figure 1 and like numerals indicate like components in the two circuits.
- a photocell i3 replaces the relative humidity responsive resistance element I3 .and capacitance II.
- Photocell I3 has a cathode'I5 and an lanode I6.
- v i l' l. n combination a voltage Source; a signal chargedev'ce including an anode, a control electrcde and a cathode; means electrically connecting said voltage source across" the discharge device; and ⁇ impedance in said 'inst-stage; means electrically connecting said voltage sourceracrossr the discharge device in said secondstage; means electrically connectingl said signal producing dev vice to the control electrode'fand across a portion' of the impedance in said first 'stage in such' a manner 'that the potentialia'cross'sa'id signal producing device will be derived across a portion'oi said impedance; means electrically connecting said impedance between the control electrode and thei'cathode of the discharge device in said secondstage to impress a Voltage thereon anda-ricci: energization of the discharge device in said seon ond stage; and means electrically connected to the discharge device in said second stage to utilize the output thereof.
- source a signal producing device; a first electronic stage having an electron discharge device including an anode, a control electrode anda cathode, and an impedance electrically connected to said cathode; a second electronic stage having an electron discharge device including an anode,
- a control electrode and a cathode means electrically connecting said alternating voltage source across the discharge device and impedance in said ilrst stage; means electrically connecting said alternating voltage source across the discharge device in said second stage; means electrically connecting said signal producing device to the control electrode in said first stage in such a manner that the potential across said signal producing device will be derived across said poran alternating voltage ⁇ kitil tronic stag'efhaving an electron vdischarge.device, including ari-'anode a 'controlelectrode andi-ra; cathode; .andianfimped'ance electrically connected. tofsaidcathode; asecond electronic .stage havingl afthyr-atron.
- an alternating voltage source a signal producing device; a first elecanc'e; means electrically connecting said voltage l" sou'rce 'across said discharge device and said n'rst resistance; and means electrically connecting said humidity responsive resistance across said second resistance and that portion of said first resistance between said point and that terminal connected to said source in such a manner that the potential across said humidity responsive resistance is derived from the voltage across said portion of said first resistance.
- electron discharge device having an anode, a control electrode and a cathode; a first resistance velectrically connected to said cathode; a second ner that the potential across said humidity responsive resistance is derived from the voltage across said portion of said first resistance.
- a source of alternating voltl age a phototube; an electron discharge device having an anode, a control electrode and a cathode; a rst resistance electrically connected to said cathode: a second resistance electrically con nected between said control electrode and a point ⁇ on said rst resistance; means electrically. connecting said voltagesource across said discharge device and said flrstlresistance; and means electrically connecting said phototube across said second resistance and that portion of said rst resistance between said point and that terminal. connected to said source in such a manner that the potential across said phototube is derived from ⁇ the voltage across said portion of said first re- ⁇ sistance.
- a source cathode a rst resistance electrically connected to. said cathode; a second resistance electrically connected between said control electrode and a pointon said rst resistance; means electrically connecting said voltage source across said dis,- Charge device and said first resistance; and means electrically connecting said phototube, in series.
- a condition responsive device an electron discharge device having an. anode, a control element and a cathode; a first resistor electrically connected to said cathode,
- said resistor having a wiper arm moving thereacross; means electrically connecting an 'alterhating voltage of line potential directly across said discharge device and said lrst resistor in series therewith; a second resistor electrically connected between said control element and the.
- a voltage source a photo--v tube; an electronic stage having an electron discharge device including an anode, a control elec-v rived across a portion of said impedance; and
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Description
Sept 12, 19,50 J. DAHLINE 2,522,348
' i ELECTRONIC AMPLIFIER Filed .my 16. 194s' maentor amis/vc; J Mlm/vf Patented Sept. 12, 195() "signor This"inventionrelates "and particularlyV to thyratron "ampliers ""It is therefore an "object of the ririventionto"provide a new and improved type of thyratron arnplir.
f Another:V object. of the .invention is 'ato .i provide an improved .type lof thyratron amplifierfin'iwhich the plate vsupply voltage may beftaken .directly fromat voltage supplyline of con'imercial-fre- .quency and amplitude.
Another object of the invention is to providel an improved type of thyratron'arplier Whereinfthe ciruit. y I l ,h advantage derived/from"thistypeofnjlifier construction that the electronflow'between the control "grid'and c'atho'd'e ofthetiiyratrh is `greatly reduced, The internal cathdetocotrol 1 'grid impedanceof the triyratronisinparaiiei "with 'the 'cathode resistance of' thefprce'd'in'g j stage and "because the imp'edance i through 1 the 'tl'iyratr'on is 'so large "in comparison fwith"y the `cathodeV follower resistance there v' iivill loealn ios't ATrio electron nowiifr'omjthe' Lcontrol gridpfth'e tliyratron. y i k Another'avantage i'sthat the hash produced will not 'back ,up through the ampliii'e'ribecause of the comparatively low'im'peidance to ground .through the cathode follower resistance. .This is .of :particular importance in "this Circuit due 150 j'the amount of noise produced bythe'thyratron.
AAnother vadvantage isthe' stabilization of the control point of the'thyratron because ofitlieA low impedance inputthereto.
' Another object is to provide a cathodefollowe'r circuit wherein-a voltagel to energize a lpreceding circuit is f obtained -frornfthat potential across the cathode follower resstance.
`Another object f the invention is to provide' a to*H electronic taipiihers 51ooiaims. (cierre-35m .",typesfinlwhicl'ithe resistance of the element .varies vviwth ther rlativefhumidity ,of the surrounding iriefdiii'ifn.'= u Y. fl' I ',Tl'i felement" fl! .controlsfthefinput voltage.. applied to .an -electron...discharge 'device'. in the ffoijr'n io i , 2|`,'fa1`coiitrol girid-2`2, a cathdefZSand aiilament 21. Oheterrninal ofthe .element ill-is connected Vseries with a condenser -I Il.. and grid current initirig*resistorfffzto'the grid. 22. The' terminal .of 'elerneht"I Ulis connectedthrough' ."vdii'cton fifi. and ag"resistor,'521i` to 'the 'cathode 23. The .r'esis'toifi#A has a sliderZG cooperating'therewith v.to form a` potentiometer, v.the .slider .26. being f 'c"onn'ectedLtlfiroughyy 'a' r`esistor2 5. to the, .-gridterrefinar'fijtiie.girilimitingresisterlsz.'- 1.. 'Po' errortheoperatioii tithe ampiietissiip- :pliei'-by.'.twojpowerTunesie.aride iiea'cung'jto a'rify stabl' urfce f pov/,crimen shown). LineA 8fis 2| "white e"91 is connecter-11h51, conductors priniaryid.. andas'econ'darBd Vhas its secondary vcathode follower circuit utilizing regenerative "feedback by'means 'of a connection from the cath- .ode follower resistor tofthe. grid of 'the tube 'in "the'cathodefllo'we stage.
"These and` other Aobjects and advantages 'may become more apparent frorntlie following, 'more detailed, description taken iin conjunction with the drawings in'which:
Figure 1 vshows acircuit embodying vthe pre- -`ierred modification ofthe invention;
Figure v2 shows .a modication 'ofthe .invention ernplo'ying'aA 'differentrneans of controllingthe input voltage. y y
Y'In-'the circuitk shown in Figure 1,; the magnitude of the 'input 'voltage is "controlleld-bya relative humidity responsive'resistance element I 0*. 4elenrieht zna'yfloeV any vone 'of various;Y Well-known relay"wifrdiiigcciitg monatl 'while une i9. @05.
The humidity responsive resistance ID, condenser II, grid current limiting resistor I2 and resistance 25 are placed across that portion of resistance 24 between the slider 23 and conductor 54 and receives a potential therefrom.
Operation When the humidity responsive resistance element is at that resistance value indicating a satisfactory humidity condition the current flow.
through the vacuum tube will be such that the aresult the potential on grid 22 is sufficiently negative with respect 'to the potential on cathode 23 to cause a very small electron iiow through the tube 20 which results in a low potential across cathode resistance 24. This low lpotential across l the cathode resistance 24 will operate to place a small potential onthe grid 32 of thyratron 30. i
The bias placed on cathode 33 by transformer secondary 34 tends to oppose the potential placed on grid 32 and the result is that the potential on the grid 32 is sufiiciently negative with respect to the potential on cathode 33 to deenergize relay When the humidity is increased the resistance of relative humidity element I0 is lessened, resulting in a larger current iiow through resistance 25 and consequently the grid 22 of tube 2U, and
thus the grid 32 of thyratron 30 is driven more knegative and relay 45 remains deenergized.
When the humidity in the medium surrounding the relative humidity' responsive resistance element I0 decreases the humidity responsive element will increase in resistance value to increasethe total impedance path across that portion of ,v lresistance 24 between the slider 26 and the conductor 54 and result in a lower current flowl in the path composed of the relative humidity responsive resistance element Ill, condenser I I, grid current limiting resistor I2, and resistance A25. This will decrease the voltage drop across resistance 25 with the result that the grid 22 of tube 20 will be driven in a; positive direction with respect to its cathode 23. The greater electron flow through tube 20 will increase the potential across resistance 24 and raise the potential on grid 32 with respect to its cathode 33 until tube 3D fires. This iiring of tube will energize relay winding and close the relay contacts 42 and 43 to place a controlling circuit into operation.
The type of relative humidity responsive re'- sistance element used in this circuit is one utilizing a salt solution such as is described in the Dunmore Patent 2,285,421 though it is understood that other types of humidity responsive resistl ance elements can be used. Because a salt solution type of relative humidity responsive resistance is used it is necessary to place a condenser in series therewith to block the direct 'current and prevent the rapid disintegration of thesalt shifting network intended to aidxin eliminating any chattering tendency of the relay ln the thyratron output circuit. The reason for this is probably due to the fact that the RC network advances the phasing of the potential on the grid of the thyratron and thus causes the thyratron to re over a larger portion of the cycle than would otherwise be the case., y
A condenser 4I is placed inparallel with relay winding 40 to smooth out the current flowing through winding 40 and further aid in eliJninating any tendency of the relay winding to chatter. Both transformer primary 44 and transformer Y, secondary 34 are tied to power source lead i). This'makes it possible to energize both `tubes and the filament transformer from the same source while making use of only one trans- .former witha single secondary winding. Filament 21 of tube 2|] is connected across the transformer secondary 34 through leads 28, 54, and 29. Filament 31 of thyratron 30 is connected across transformer secondary 34 by leads 33 and 39.
I Values of various components Which have been found to work satisfactorily in the circuit are as follows:
.Resistance I2 megohms 5.0 Resistance 25 megohms 5.0 Resistance 24 kilohms 50 Resistance 35 megohms 1.0 Condenser 36 microfarads-- 0.05
with causes most of the current iiow to pass therethrough. This prevents the thyratron from burning out because of too large a grid current.
Also because or' the comparatively small value of` the cathode follower resistance with respect to the internal cathode to grid impedance 0f the tube in the cathode follower stage any undesired incise from the thyratron which' might otherwise backup through the amplifier will be largely drained olf and so will not affect the operation of the circuit.
Species of Figure 2 I Figure 2 shows a circuit employing a different means of controlling the input voltage.
The overallcircuit in Figure 2 is very similar to that in Figure 1 and like numerals indicate like components in the two circuits. In Figure 2 a photocell i3 replaces the relative humidity responsive resistance element I3 .and capacitance II. Photocell I3 has a cathode'I5 and an lanode I6.
Briefly the operation of 4the circuit in Figure 2 is as follows. I YAt the condition where no light strikes the cathode I5 there 4will be no electrons emitted therefrom and as a result there will be no current owing through the circuit. composed of photocell I3, grid currentv limiting resistor I2, resistance 25 and across lthat 4portion of resistance 24 between the slider 25 'and conductor 54. vAs a result there will be no voltage drop across resistance 25 and grid 22 will be sufficiently positive with respect to cathode l23 to permit tube 22 to be energized. 'Upon energization of` tube 25, grid 32 of thyratron 3Ilwill be sufficiently positive with respect to cathode 33 to permit thyratron .30 to lire. Firing of thyratron 3l) energizes relay` winding 45', closing contacts 42 and 43 to place a controlling'circulit into operation.
when a iight is` directsegur() Cathode I5 of 5; phot-,odell IAS astreamof electrons Williiow y.from cathode I5 to anode I6 and a current will Vflow through resistance 25 to drivethe v.potential-ongri'cllZ-Z negativewith respect to that kpotential on. This ylowering oi the potentialuon` cathode 23; grid.A 22 deenergizestube 2n, and the resulting potential placed on grid 32 will be=suiiiciently negative to prevent thyr'atron 30 irom--ring.` When tube Sil is de'energizedrelay Vdirlisalso 'de-1` energized, permitting contacts .42 :andr to ybreak connection and open thecontr'olling -i'iircui't-` I f It ni'gl-lt be -noted that Whereas in `Figure '.1 'the condenser Il prevents Aany direct current `from flowing through the relative humidity element IU to the grid 22 of tube 20 the -photocell `t3v in Eigur'e'2 prevents any alternating'current-irofn flowing *to the gr-id 22'. finis-does not, however,-
cnanige kthe characteristics 'of 'the circuit;
t is to be understood thattheli-.nvention herein disclosed is not to be considered limited 'to the two-modifications described but rather-to be defined 'Within thesco'pe of thev appended claims.
`I claim as my invention: v i l' l. n combination: a voltage Source; a signal chargedev'ce including an anode, a control electrcde and a cathode; means electrically connecting said voltage source across" the discharge device; and` impedance in said 'inst-stage; means electrically connecting said voltage sourceracrossr the discharge device in said secondstage; means electrically connectingl said signal producing dev vice to the control electrode'fand across a portion' of the impedance in said first 'stage in such' a manner 'that the potentialia'cross'sa'id signal producing device will be derived across a portion'oi said impedance; means electrically connecting said impedance between the control electrode and thei'cathode of the discharge device in said secondstage to impress a Voltage thereon anda-ricci: energization of the discharge device in said seon ond stage; and means electrically connected to the discharge device in said second stage to utilize the output thereof.
2. In combination: source; a signal producing device; a first electronic stage having an electron discharge device including an anode, a control electrode anda cathode, and an impedance electrically connected to said cathode; a second electronic stage having an electron discharge device including an anode,
a control electrode and a cathode; means electrically connecting said alternating voltage source across the discharge device and impedance in said ilrst stage; means electrically connecting said alternating voltage source across the discharge device in said second stage; means electrically connecting said signal producing device to the control electrode in said first stage in such a manner that the potential across said signal producing device will be derived across said poran alternating voltage` kitil tronic stag'efhaving an electron vdischarge.device, including ari-'anode a 'controlelectrode andi-ra; cathode; .andianfimped'ance electrically connected. tofsaidcathode; asecond electronic .stage havingl afthyr-atron. including an anode,l a control elecs trod'e and: 'a cathode; means electricallyconnects-5l l ofthe thyratron in said second stage; and means electrically connected to the thyratron in said second stage to utilize the output-thereof.
4. In combination: `"a voltage source;l a signal producing dev-ice;- an electronic stage having an electron dischargedevice including-an anode; a control-'electrode vand a cathode, and an imped-4 ance electrically connected to 'said cathode; `means electrically connecting said voltage "source across the discharge device and impedance in said stage; means electrically connecting 'said signal producingdevice to the control electrode and across a portion of the impedance in said stage insuch-a manner that the potential across said signal rpro-- ducin'g device will be derived across a portion'oi said impedance; and "outputcircuit elements connected to said resistor at electrically vspaced points.`
5. In combination; a 'source of alternating voltage; -a humidity responsivev resistance; an electron discharge device having an anode, a control electrode and a cathode; a' first 'resistance electrically connectedto said cathode; a second resistance electrically connected 'between said" control electrode and a point on said irstresist-y tion of said impedance; means electrically condischarge device in said second stage; and means electrically connected to the discharge device in said second stage to utilize the output thereof.
3. In combination: an alternating voltage source; a signal producing device; a first elecanc'e; means electrically connecting said voltage l" sou'rce 'across said discharge device and said n'rst resistance; and means electrically connecting said humidity responsive resistance across said second resistance and that portion of said first resistance between said point and that terminal connected to said source in such a manner that the potential across said humidity responsive resistance is derived from the voltage across said portion of said first resistance.
6. In combination; a source of alternating voltage; a humidity responsive resistance; an
electron discharge device having an anode, a control electrode and a cathode; a first resistance velectrically connected to said cathode; a second ner that the potential across said humidity responsive resistance is derived from the voltage across said portion of said first resistance.
7. In combination; a source of alternating voltl age; a phototube; an electron discharge device having an anode, a control electrode and a cathode; a rst resistance electrically connected to said cathode: a second resistance electrically con nected between said control electrode and a point` on said rst resistance; means electrically. connecting said voltagesource across said discharge device and said flrstlresistance; and means electrically connecting said phototube across said second resistance and that portion of said rst resistance between said point and that terminal. connected to said source in such a manner that the potential across said phototube is derived from` the voltage across said portion of said first re-` sistance.
8. In combination; a source cathode; a rst resistance electrically connected to. said cathode; a second resistance electrically connected between said control electrode and a pointon said rst resistance; means electrically connecting said voltage source across said dis,- Charge device and said first resistance; and means electrically connecting said phototube, in series.
with a current limiting resistance, across said second resistance and that portion of said first resistance between said pointand that terminal connected to said source in such -a manner that the potential across saidphototube is derived from the voltage across said portion of saidv first resistance.
9. In combination: a condition responsive device; an electron discharge device having an. anode, a control element and a cathode; a first resistor electrically connected to said cathode,
said resistor having a wiper arm moving thereacross; means electrically connecting an 'alterhating voltage of line potential directly across said discharge device and said lrst resistor in series therewith; a second resistor electrically connected between said control element and the.
Wiper larm associated with s'aid first resistor;
means electrically connecting said condition responsive device between said control element and the terminal of said rst resisto-r distant from said cathode such that the voltage across said condition responsive device is derived from the of alternating voltage; a phototube; an electron discharge de. vice having an anode, a control electrode and aV voltage across that portion of the first resistcit between the wiper arm and that terminal distantfrom .said cathode; a gaseous discharge device` having an anode, a control element and a cath-- ode; means electrically connecting anI alternating voltage of line potential across ysaid gaseous discharge device such that the phase of the voltage between the anodes and cathodes of said discharge devices is the same; means connecting the cathode of said `first discharge device to the con#y trol element of said gaseous discharge device through a phase shifter network; and a device in' the output circuit of said gaseous discharge de# vice to be energized upon energization of said gaseous discharge device.
10. In combination: a voltage source; a photo--v tube; an electronic stage having an electron discharge device including an anode, a control elec-v rived across a portion of said impedance; and
output circuit elements connected to said resistor at electrically spaced points.
LAWRENCE J. DAHLINE.
REFERENCES CITED The following references are of record in the lle of this patent:
UNITED STATES PATENTS Number Name Date 1,867,398 Cockrell July 12, 1932 2,160,037 Shepard, Jr May 30, 1939 2,178,985 Blumlein Nov. 7, 1939 2,299,731 Arendt Oct. 27, 1942 2,413,218 Coroniti Dec. 24, 1946 2,424,735 Boothroyd July 29, 1947 2.436.762 Turin et al. Feb. 24. 1948
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US39016A US2522348A (en) | 1948-07-16 | 1948-07-16 | Electronic amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US39016A US2522348A (en) | 1948-07-16 | 1948-07-16 | Electronic amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2522348A true US2522348A (en) | 1950-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US39016A Expired - Lifetime US2522348A (en) | 1948-07-16 | 1948-07-16 | Electronic amplifier |
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| Country | Link |
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| US (1) | US2522348A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1073598B (en) * | ||||
| US2663190A (en) * | 1950-11-16 | 1953-12-22 | Bell Telephone Labor Inc | Humidity indicator |
| US2742780A (en) * | 1950-10-27 | 1956-04-24 | Honeywell Regulator Co | Moisture indicating apparatus |
| US2958015A (en) * | 1954-07-09 | 1960-10-25 | George E Koslow | Electronic amplifiers |
| US3031881A (en) * | 1958-12-24 | 1962-05-01 | Ipsen Ind Inc | Apparatus for measuring carbon potential |
| US3883757A (en) * | 1972-04-20 | 1975-05-13 | Frederick N Lancia | Bridge circuit for environmental condition control |
| GB2415965A (en) * | 2004-07-07 | 2006-01-11 | Chevron Usa Inc | Use of Fischer Tropsch acid fraction as a corrosion inhibitor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1867398A (en) * | 1931-10-28 | 1932-07-12 | Gen Electric | Control circuit for vapor electric discharge devices |
| US2160037A (en) * | 1937-06-30 | 1939-05-30 | Rca Corp | Photoelectric relay |
| US2178985A (en) * | 1934-09-04 | 1939-11-07 | Emi Ltd | Thermionic valve circuit |
| US2299731A (en) * | 1940-04-16 | 1942-10-27 | Arendt Morton | Display system for moving vehicles |
| US2413218A (en) * | 1943-07-28 | 1946-12-24 | Gen Aniline & Film Corp | Photographic apparatus |
| US2424735A (en) * | 1947-07-29 | Humidity control apparatus | ||
| US2436762A (en) * | 1947-01-16 | 1948-02-24 | Surface Combustion Corp | Electronic control apparatus |
-
1948
- 1948-07-16 US US39016A patent/US2522348A/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2424735A (en) * | 1947-07-29 | Humidity control apparatus | ||
| US1867398A (en) * | 1931-10-28 | 1932-07-12 | Gen Electric | Control circuit for vapor electric discharge devices |
| US2178985A (en) * | 1934-09-04 | 1939-11-07 | Emi Ltd | Thermionic valve circuit |
| US2160037A (en) * | 1937-06-30 | 1939-05-30 | Rca Corp | Photoelectric relay |
| US2299731A (en) * | 1940-04-16 | 1942-10-27 | Arendt Morton | Display system for moving vehicles |
| US2413218A (en) * | 1943-07-28 | 1946-12-24 | Gen Aniline & Film Corp | Photographic apparatus |
| US2436762A (en) * | 1947-01-16 | 1948-02-24 | Surface Combustion Corp | Electronic control apparatus |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1073598B (en) * | ||||
| US2742780A (en) * | 1950-10-27 | 1956-04-24 | Honeywell Regulator Co | Moisture indicating apparatus |
| US2663190A (en) * | 1950-11-16 | 1953-12-22 | Bell Telephone Labor Inc | Humidity indicator |
| US2958015A (en) * | 1954-07-09 | 1960-10-25 | George E Koslow | Electronic amplifiers |
| US3031881A (en) * | 1958-12-24 | 1962-05-01 | Ipsen Ind Inc | Apparatus for measuring carbon potential |
| US3883757A (en) * | 1972-04-20 | 1975-05-13 | Frederick N Lancia | Bridge circuit for environmental condition control |
| GB2415965A (en) * | 2004-07-07 | 2006-01-11 | Chevron Usa Inc | Use of Fischer Tropsch acid fraction as a corrosion inhibitor |
| GB2415965B (en) * | 2004-07-07 | 2006-12-27 | Chevron Usa Inc | Reducing metal corrosion of hydrocarbons using acidic fischer-tropsch products |
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