US2499494A - Clogged filter signal device - Google Patents
Clogged filter signal device Download PDFInfo
- Publication number
- US2499494A US2499494A US525119A US52511944A US2499494A US 2499494 A US2499494 A US 2499494A US 525119 A US525119 A US 525119A US 52511944 A US52511944 A US 52511944A US 2499494 A US2499494 A US 2499494A
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- valve
- fluid
- pressure
- pump
- passage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000012530 fluid Substances 0.000 description 26
- 230000007812 deficiency Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000006854 communication Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
Definitions
- the present invention pertains to electric safety means in hydraulic circuits.
- the aforesaid safety valve may be associated with an unloader valve which will relieve the pump efiectively as long as the circuit is under pressure.
- Fig. 1 is a schematic illustration of a hydraulic circuit according to the present invention.
- i 2 is a crosssection of the unloader valve included inglthe circuit according to Fig. -1.
- Fig. 3 is a cross section of the electrically controlled valve and its actuating mechanism included in the circuit according to Fig. 1.
- Fig. 4 is a cross section of the electric signal device included in the circuit according to Fig. 1.
- a pump l which is supplied with fluid from a reservoir 2 through a filter 3.
- an automatic signal device 6 which will actuate a buzzer I or the like Whenever the flow of fluid to pump I is cut out because of the filter 3 being clogged.
- Switch 8 which will actuate an electrically controlled valve 9.
- Switch 8 communicates through conduit I with conduit a and whenever the fluid pressure in the latter exceeds a predetermined value switch 8 will energize valve 3 which communicates with valve 4 through a conduit I3 which will by pass fluid to a return line II and cause valve 4 to unload pump I until the pressure in conduit 5a drops to the desired minimum value.
- Valve 4 includes a casing I! (Fig. 2) provided with a cylinder bore I5 and I9. Passage I'la is connected to the pump, passage no to conduit 5, passage I3 to return line I4 and passage I3 to conduit I3.
- a piston like valve element 20 is slidably mounted in bore I6.
- Element 20 carries an extension 2I whose head 22 is adapted to cooperate with a valve seat 23 in passage I8 to obstruct the latter.
- a passage 24 of relatively small diameter extends through element 20 in the axial direction.
- a spring 25 urges element 20 towards seat 23.
- element 20 divides bore I5 into two variable volume chambers 26 and 21 between which passage 24 afiords restricted communi cation.
- passage I3 In operation, when passage I3 is closed, pressure arriving through passage I in will pass through chamber 21 and passage 24 into chamber 26. Since the effective cross sectional area of element 20 is greater in chamber 25 than in chamber 21 head 22 will be firmly applied against seat 23. Pressure fluid supplied by pump I will, accordingly, pass on through passage I'Ib to conduit 5.
- the diameter of passage 24 governs the speed with which the valve opens.
- conduit I3 connects passage I9 of valve 4 to valve 3.
- Valve 3 comprises a casing 30 provided with a cylinder bore 3i and two ports 32, 33. conduit I3 and port 33 withconduit I I.
- casing 30 there is mounted a solenoid 34 whose opening is concentric with and of the same diameter as bore 3I.
- a piston like valve element 35 is slidably mounted in bore 3I. Head 36 of element 35 projects into solenoid 34. Element 35 has a reduced portion 31 whose dimension in the actual direction exceeds that of port 32.
- Port 32 communicates with the pilot means may be very small to those of the associated unloader valve.
- check valve 12 closes separates the utilization system from the pump Solenoid 84 is connected by cables 39, 89 to source of electric energy 40 and switch 8.
- Switch 8 includes a cylinder 4
- a spring 45 holds a piston 42 slidably engaged to a cylinder 4
- Cable 38 is connected to cylinder ti and cable 39 ends at a contact 44 facing rod 43.
- Switch 8 is, of course, made oi! a material'which is a good conductor of electricity.
- valve 8 and switch 8 on a much larger scale than valve 4.
- valve 9 and switch I are merely pilot means controlling valve 4 and the amount of fluid which circulates through the pilot means need be no more than a small fraction of that circulating through the unloader valve. Accordingly, the dimensions of with respect resulting economy of bulk and weight is a. par tlcular advantage on vehicles or aircraft.
- Signal device 8 (Fig. 4) includes a cylinder 50 position shown when the current is shut in thefeed line of pump I. Inside cylinder 50 there is provided a piston 5
- Piston 68 carries a rod 53 projecting to the outside of cylinder 59.
- Rod 53 ends in a contact plate 58 facing another contact plate 55. Both contact plates are wired to a suitable source of electricity and to a bell buzzer or the like.
Description
March 7, 1950 GREER 2,499,494
CLOGGED FILTER SIGNAL DEVICE Filed March 4, 1944 5 INVENTOR. Edward M. (ireer' BY Q /J M ATTORNEY l tmus Mu. 7, 1950 CLOGGED FILTER SIGNAL DEVICE Edward M. Greer, West Hempstead, N. 32.; assignor to Greer Hydraulics, Inc., Brooklyn, N. Y.
Application March 4, 1944, Serial No. 525,119
1 Claim. 1. The present invention pertains to electric safety means in hydraulic circuits.
It is an object of the present invention to provide an electrically controlled safety valve which' will by-pass any excess pressure which may oc cur.
According to a feature ofthe present inven' tion the aforesaid safety valve may be associated with an unloader valve which will relieve the pump efiectively as long as the circuit is under pressure.
It is a further object 01' the present invention to provide an electric signal device which will automatically announce any deficiency in the feed line of a pump or the like included in a hydraulic circuit.
Further features of the present invention will become apparent from the following description 01 embodiments thereof given by way of example and illustrated in the accompanying drawings.
Fig. 1 is a schematic illustration of a hydraulic circuit according to the present invention.
i 2 is a crosssection of the unloader valve included inglthe circuit according to Fig. -1.
Fig. 3 is a cross section of the electrically controlled valve and its actuating mechanism included in the circuit according to Fig. 1.
Fig. 4 is a cross section of the electric signal device included in the circuit according to Fig. 1.
In the embodiment according to Fig. 1 there is provided a pump l which is supplied with fluid from a reservoir 2 through a filter 3.
From pump I the fluid passes through an unloader valve 4 and on through conduit 5, past a check valve I2 connected to conduit 5a to a utilization system. When valve 4 is in the open position fluid returns to reservoir 2 through conduit I4.
.There is included in the circuit according to Fig. 1 an automatic signal device 6 which will actuate a buzzer I or the like Whenever the flow of fluid to pump I is cut out because of the filter 3 being clogged.
There is further included a pressure switch 8 which will actuate an electrically controlled valve 9. Switch 8 communicates through conduit I with conduit a and whenever the fluid pressure in the latter exceeds a predetermined value switch 8 will energize valve 3 which communicates with valve 4 through a conduit I3 which will by pass fluid to a return line II and cause valve 4 to unload pump I until the pressure in conduit 5a drops to the desired minimum value.
' Valve 4 includes a casing I! (Fig. 2) provided with a cylinder bore I5 and I9. Passage I'la is connected to the pump, passage no to conduit 5, passage I3 to return line I4 and passage I3 to conduit I3.
A piston like valve element 20 is slidably mounted in bore I6. Element 20 carries an extension 2I whose head 22 is adapted to cooperate with a valve seat 23 in passage I8 to obstruct the latter.
A passage 24 of relatively small diameter extends through element 20 in the axial direction.
A spring 25 urges element 20 towards seat 23.
In this manner element 20 divides bore I5 into two variable volume chambers 26 and 21 between which passage 24 afiords restricted communi cation.
In operation, when passage I3 is closed, pressure arriving through passage I in will pass through chamber 21 and passage 24 into chamber 26. Since the effective cross sectional area of element 20 is greater in chamber 25 than in chamber 21 head 22 will be firmly applied against seat 23. Pressure fluid supplied by pump I will, accordingly, pass on through passage I'Ib to conduit 5.
But, whenever passage I3 is vented, the pressure in chamber 26 will drop and element 20 will be displaced so as to compress spring 2! and to open passage I8. This will cause the pump to deliver into return line I4 and reduce the load to a pressure corresponding to tli: strength of spring 25.
Obviously, the diameter of passage 24 governs the speed with which the valve opens.
Referring to Fig. 3 conduit I3 connects passage I9 of valve 4 to valve 3. Valve 3 comprises a casing 30 provided with a cylinder bore 3i and two ports 32, 33. conduit I3 and port 33 withconduit I I.
Above casing 30 there is mounted a solenoid 34 whose opening is concentric with and of the same diameter as bore 3I.
A piston like valve element 35 is slidably mounted in bore 3I. Head 36 of element 35 projects into solenoid 34. Element 35 has a reduced portion 31 whose dimension in the actual direction exceeds that of port 32.
Normally, element 35 is in the position shown and port 32 is obstructed. But, when solenoid 34 is energized, element 36 will be attracted and raised so that ports 32 and 33 communicate with each other about the reduced portion 31. Thus. when solenoid 34 is energized chamber 23 0! Valve 4 (Fig. 2) is vented.
and passages Ila, IIb. II
-valve 4 begins to drop, check valve 12 closes separates the utilization system from the pump Solenoid 84 is connected by cables 39, 89 to source of electric energy 40 and switch 8. v
Switch 8 includes a cylinder 4| communicating through conduit I with conduit to. A spring 45 holds a piston 42 slidably engaged to a cylinder 4| and carries a rod 43 projecting to the outside.
with this structure, when the pressure in con-=- duit 5a overcomes the strength of. spring 45 which acts on piston 42, red 43 will approach and, eventually, engage contact 44 whereby solenoid 84 will be energized,
For the sake of clarity, thev drawings show valve 8 and switch 8 on a much larger scale than valve 4. It will be appreciated that valve 9 and switch I are merely pilot means controlling valve 4 and the amount of fluid which circulates through the pilot means need be no more than a small fraction of that circulating through the unloader valve. Accordingly, the dimensions of with respect resulting economy of bulk and weight is a. par tlcular advantage on vehicles or aircraft.
It is also evident that fluid pressure is delivered by the pump into conduit 5a and the utilization sysmm until spring 45 is fully compressed.
Then, as soon as the pressure in passage ill) of;
while. the latter is unloaded.
This arrangement affords the further advantage that except for the negligible amount corresponding to the displacement of the ball or poppet in valve i2'--no fluid is withdrawn from the utilization'system so that the same is maintained at the desired maximum value of pressure-governed by' the strength of spring 45- while the pump is beingrunloaded. with the unloader valves known heretofore a certain amount of fluid is generally required to be supplied by the utilization system (accumulator) to assist in the unloading operation. This withdrawal makes it impossible to maintain the system at the desired maximum pressure while the pump is idling.
Of course, as soon as the pressure in conduit 5a drops below the desired maximum pressure, spring 45 will push piston 42 back, the electric current is interrupted, element 85 of valve 9 drops back into closed position, pressure can build up in chamber 28 of valve 4. head 22 obstructs passage I8 and the pump starts reloading the system.
If it is.uncertain,that element 35 can always be returned into closed position by gravity, then, it is advantageous to add a spring to the structure of valve 9 in order to return element 95 into the oil. v
Signal device 8 (Fig. 4) includes a cylinder 50 position shown when the current is shut in thefeed line of pump I. Inside cylinder 50 there is provided a piston 5| urged by a spring 52 in a direction opposed to the normal flow oi fluid.
4 r Piston 68 carries a rod 53 projecting to the outside of cylinder 59.
When the suction pressure in cylinder 50 rises above a predetermined value-due to non-deliv- P cry of fluid through 6, the filter piston 85 will be drawn by the suction against spring 62 so as to compress the same whereby rod 53 will be displaced and contact 56 will approach and eventually engage contact 55. Accordingly, the buzzer or the like will sound warning the operator to stop the pump until the deficiency in the supply of fluid can be removed. The cylinder, piston, spring and rod formulates a switch mechanism.
The foregoing description is not intended to limit the present invention which extends to all changes, modifications and equivalents within the scope of the appended claim.
What is claimed is:
The combination of a fluid filter, a normally open negative fluid pressure switch mechanism, a remote indicator and a pump, said switch closed by a negative fluid pressure, means to draw fluid from said fluid filter in a hydraulic system, means to pass said fluid through the negative fluid pressure operated switch mechanism, means to actuate said remote indicator when the fluid pressure in said switch is below a predetermined value, and means to deliver the fluid to a pump while operating, said fluid switch mechanism including resilient means to retain it open normally, means to close said fluid switch mechanism when said filter becomes .clogged and a negative pressure is attained in said fluid switch I to overcome the normal" resilient holding means.
EDWARD M. GREER.
I REFEEENGES EJITED UNITED STATES PATENTS Number Name Date 556,008 Harris Mar. 10, 1896 757,901 Fairhurst Apr. 19, 1904 777,677 Kettering Dec. 20, 1904 844,923 Cridge Feb. 19, 1907 895,426 Cable Aug. 11, 1908 1,148,054 Rosencrans July 27, 1915 1,240,664 Brown Sept. 18, 1917 1,307,207 Mitchell June 17, 1919 1,408,221 Pendergast Feb. 28, 1922 1,411,802 Mosher Apr. 4, 1922 1,507,193 May et al. Sept. 2, 1924 1,798,973 Cordier Mar. 31, 1931 1,938,711 McMurray Dec. 12, 1933 2,236,087 Detwiler Mar. 25, 1941 2,264,024 Glashan Nov. 25, 1941 2,319,578 Beckley May 18, 1943 2,320,763 Trautman June 1, 1943 2,345,213 OShei Mar. 28, 1944 2,402,885 Gilfillan June 25, 1946 2,426,411 Petersen Aug. 26, 1947
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US525119A US2499494A (en) | 1944-03-04 | 1944-03-04 | Clogged filter signal device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US525119A US2499494A (en) | 1944-03-04 | 1944-03-04 | Clogged filter signal device |
Publications (1)
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US2499494A true US2499494A (en) | 1950-03-07 |
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US525119A Expired - Lifetime US2499494A (en) | 1944-03-04 | 1944-03-04 | Clogged filter signal device |
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Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2729339A (en) * | 1953-08-28 | 1956-01-03 | Purolator Products Inc | Automatic discriminatory clogging detector for oil filters |
US2757801A (en) * | 1953-05-05 | 1956-08-07 | Muggli Meinrad | Signal devices for filters |
US2794183A (en) * | 1954-11-04 | 1957-05-28 | Phillips Petroleum Co | Breathing tank odor filter and warning device |
US2809248A (en) * | 1954-03-04 | 1957-10-08 | James F Tapp | Oil filter signalling means |
US2810034A (en) * | 1955-04-19 | 1957-10-15 | Briggs Filtration Co | Filter signal |
US2865442A (en) * | 1953-07-29 | 1958-12-23 | Havilland Engine Co Ltd | Fuel supply systems for liquid fuel engines |
US2955711A (en) * | 1958-07-10 | 1960-10-11 | Foxboro Co | Liquid filter system |
US2971648A (en) * | 1957-06-19 | 1961-02-14 | Union Tank Car Co | Method and apparatus for controlling the feed of filter aid to a filter arrangement |
US3056379A (en) * | 1960-08-15 | 1962-10-02 | Marvel Eng Co | Automatic filter signal assemblies |
US3073452A (en) * | 1957-02-25 | 1963-01-15 | Ward Ind Corp | Sub filter safety medium |
US3088593A (en) * | 1959-03-02 | 1963-05-07 | Murray Corp | Leveling and stabilizing apparatus |
US3103952A (en) * | 1960-03-28 | 1963-09-17 | Bendix Corp | Visible filter clogging indicator |
US3119437A (en) * | 1960-10-31 | 1964-01-28 | Hartford Machine Screw Co | Fuel injection system |
US3224584A (en) * | 1962-04-02 | 1965-12-21 | Rosaen Filter Co | Combination filter and unloading valve |
US3250242A (en) * | 1964-03-30 | 1966-05-10 | William L Fisher | Clogged filter indicator device |
US3278030A (en) * | 1962-09-17 | 1966-10-11 | Rosaen Filter Co | Supercharged filter unit |
US3348684A (en) * | 1966-01-26 | 1967-10-24 | Dollinger Corp | Sump filter with indicator |
US3361881A (en) * | 1965-12-09 | 1968-01-02 | William J. De Gain | Fluid power control system and components |
US3386581A (en) * | 1964-09-03 | 1968-06-04 | Dick Valentine Gough | Liquid separators |
US3394812A (en) * | 1963-07-10 | 1968-07-30 | Dynalectron Corp | Hydraulic system conditioning apparatus |
US3411272A (en) * | 1966-02-07 | 1968-11-19 | Michigan Dynamics Inc | Automatic fluid bypass sensing, actuating, and indicating system |
US3473662A (en) * | 1967-11-13 | 1969-10-21 | Marvel Eng Co | Air-operated filtering system |
US3528548A (en) * | 1967-04-26 | 1970-09-15 | K & L Electronics Inc | Electrical circuit for temperature control of swimming pool water |
US3786921A (en) * | 1972-02-14 | 1974-01-22 | Baker Hydro Inc | Heater bypass and shut-off valve |
US4061026A (en) * | 1976-05-07 | 1977-12-06 | United Technologies Corporation | Full throttle, specific speed tests in internal combustion engine diagnostics |
US5935426A (en) * | 1997-08-08 | 1999-08-10 | Teledyne Industries, Inc., A California Corporation | Water treatment device with volumetric and time monitoring features |
US6149801A (en) * | 1997-08-08 | 2000-11-21 | Water Pik, Inc,. | Water treatment device with volumetric monitoring features |
US20050098485A1 (en) * | 2003-10-01 | 2005-05-12 | Water Pik, Inc. | End-of-faucet filter |
US20060226084A1 (en) * | 2005-04-08 | 2006-10-12 | Gross Donald P | Marine vessel liquid strainer clogging indicator and method |
Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US556008A (en) * | 1896-03-10 | Anthony harris | ||
US757901A (en) * | 1902-04-29 | 1904-04-19 | John J Riley | Unloading device for air-compressors. |
US777677A (en) * | 1904-02-16 | 1904-12-20 | Preston A Kettering | Automatic gas danger-signal. |
US844923A (en) * | 1906-02-16 | 1907-02-19 | Edmund Lomax Cridge | Automatic shut-off for fluids. |
US895426A (en) * | 1907-11-30 | 1908-08-11 | Electric Boat Co | Pressure-reducing valve. |
US1148054A (en) * | 1912-08-16 | 1915-07-27 | Herman F Rosencrans | Pumping system. |
US1240664A (en) * | 1915-06-14 | 1917-09-18 | Earl William Brown | Unloading-valve. |
US1307207A (en) * | 1919-06-17 | James w | ||
US1408221A (en) * | 1922-02-28 | Pressure detector | ||
US1411802A (en) * | 1922-04-04 | Charles z | ||
US1507193A (en) * | 1924-09-02 | Cut-out | ||
US1798973A (en) * | 1929-03-20 | 1931-03-31 | Sipro Ets | Control device for valves |
US1938711A (en) * | 1932-03-08 | 1933-12-12 | John C Mcmurray | Oil indicator for internal combustion engines |
US2236087A (en) * | 1940-04-04 | 1941-03-25 | Taylor Instrument Co | Pasteurizing system |
US2264024A (en) * | 1941-02-07 | 1941-11-25 | Glashan John Homer | Vacuum controlled caution signal for automobiles |
US2319578A (en) * | 1941-08-02 | 1943-05-18 | Electrimatic Corp | Valve |
US2320763A (en) * | 1941-11-29 | 1943-06-01 | Bendix Aviat Ltd | Pilot valve |
US2345213A (en) * | 1942-03-31 | 1944-03-28 | O'shei William Edward | Fluid pressure motor system |
US2402885A (en) * | 1943-03-27 | 1946-06-25 | Chrysler Corp | Apparatus for controlling the power plants of aircraft |
US2426411A (en) * | 1941-09-08 | 1947-08-26 | Hannifin Corp | Pressure control for hydraulic presses |
-
1944
- 1944-03-04 US US525119A patent/US2499494A/en not_active Expired - Lifetime
Patent Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1411802A (en) * | 1922-04-04 | Charles z | ||
US556008A (en) * | 1896-03-10 | Anthony harris | ||
US1507193A (en) * | 1924-09-02 | Cut-out | ||
US1307207A (en) * | 1919-06-17 | James w | ||
US1408221A (en) * | 1922-02-28 | Pressure detector | ||
US757901A (en) * | 1902-04-29 | 1904-04-19 | John J Riley | Unloading device for air-compressors. |
US777677A (en) * | 1904-02-16 | 1904-12-20 | Preston A Kettering | Automatic gas danger-signal. |
US844923A (en) * | 1906-02-16 | 1907-02-19 | Edmund Lomax Cridge | Automatic shut-off for fluids. |
US895426A (en) * | 1907-11-30 | 1908-08-11 | Electric Boat Co | Pressure-reducing valve. |
US1148054A (en) * | 1912-08-16 | 1915-07-27 | Herman F Rosencrans | Pumping system. |
US1240664A (en) * | 1915-06-14 | 1917-09-18 | Earl William Brown | Unloading-valve. |
US1798973A (en) * | 1929-03-20 | 1931-03-31 | Sipro Ets | Control device for valves |
US1938711A (en) * | 1932-03-08 | 1933-12-12 | John C Mcmurray | Oil indicator for internal combustion engines |
US2236087A (en) * | 1940-04-04 | 1941-03-25 | Taylor Instrument Co | Pasteurizing system |
US2264024A (en) * | 1941-02-07 | 1941-11-25 | Glashan John Homer | Vacuum controlled caution signal for automobiles |
US2319578A (en) * | 1941-08-02 | 1943-05-18 | Electrimatic Corp | Valve |
US2426411A (en) * | 1941-09-08 | 1947-08-26 | Hannifin Corp | Pressure control for hydraulic presses |
US2320763A (en) * | 1941-11-29 | 1943-06-01 | Bendix Aviat Ltd | Pilot valve |
US2345213A (en) * | 1942-03-31 | 1944-03-28 | O'shei William Edward | Fluid pressure motor system |
US2402885A (en) * | 1943-03-27 | 1946-06-25 | Chrysler Corp | Apparatus for controlling the power plants of aircraft |
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2757801A (en) * | 1953-05-05 | 1956-08-07 | Muggli Meinrad | Signal devices for filters |
US2865442A (en) * | 1953-07-29 | 1958-12-23 | Havilland Engine Co Ltd | Fuel supply systems for liquid fuel engines |
US2729339A (en) * | 1953-08-28 | 1956-01-03 | Purolator Products Inc | Automatic discriminatory clogging detector for oil filters |
US2809248A (en) * | 1954-03-04 | 1957-10-08 | James F Tapp | Oil filter signalling means |
US2794183A (en) * | 1954-11-04 | 1957-05-28 | Phillips Petroleum Co | Breathing tank odor filter and warning device |
US2810034A (en) * | 1955-04-19 | 1957-10-15 | Briggs Filtration Co | Filter signal |
US3073452A (en) * | 1957-02-25 | 1963-01-15 | Ward Ind Corp | Sub filter safety medium |
US2971648A (en) * | 1957-06-19 | 1961-02-14 | Union Tank Car Co | Method and apparatus for controlling the feed of filter aid to a filter arrangement |
US2955711A (en) * | 1958-07-10 | 1960-10-11 | Foxboro Co | Liquid filter system |
US3088593A (en) * | 1959-03-02 | 1963-05-07 | Murray Corp | Leveling and stabilizing apparatus |
US3103952A (en) * | 1960-03-28 | 1963-09-17 | Bendix Corp | Visible filter clogging indicator |
US3056379A (en) * | 1960-08-15 | 1962-10-02 | Marvel Eng Co | Automatic filter signal assemblies |
US3119437A (en) * | 1960-10-31 | 1964-01-28 | Hartford Machine Screw Co | Fuel injection system |
US3224584A (en) * | 1962-04-02 | 1965-12-21 | Rosaen Filter Co | Combination filter and unloading valve |
US3278030A (en) * | 1962-09-17 | 1966-10-11 | Rosaen Filter Co | Supercharged filter unit |
US3394812A (en) * | 1963-07-10 | 1968-07-30 | Dynalectron Corp | Hydraulic system conditioning apparatus |
US3250242A (en) * | 1964-03-30 | 1966-05-10 | William L Fisher | Clogged filter indicator device |
US3386581A (en) * | 1964-09-03 | 1968-06-04 | Dick Valentine Gough | Liquid separators |
US3361881A (en) * | 1965-12-09 | 1968-01-02 | William J. De Gain | Fluid power control system and components |
US3348684A (en) * | 1966-01-26 | 1967-10-24 | Dollinger Corp | Sump filter with indicator |
US3411272A (en) * | 1966-02-07 | 1968-11-19 | Michigan Dynamics Inc | Automatic fluid bypass sensing, actuating, and indicating system |
US3528548A (en) * | 1967-04-26 | 1970-09-15 | K & L Electronics Inc | Electrical circuit for temperature control of swimming pool water |
US3473662A (en) * | 1967-11-13 | 1969-10-21 | Marvel Eng Co | Air-operated filtering system |
US3786921A (en) * | 1972-02-14 | 1974-01-22 | Baker Hydro Inc | Heater bypass and shut-off valve |
US4061026A (en) * | 1976-05-07 | 1977-12-06 | United Technologies Corporation | Full throttle, specific speed tests in internal combustion engine diagnostics |
US6106705A (en) * | 1997-08-08 | 2000-08-22 | Teledyne Industries, Inc. | Water treatment device with volumetric and time monitoring features |
US5935426A (en) * | 1997-08-08 | 1999-08-10 | Teledyne Industries, Inc., A California Corporation | Water treatment device with volumetric and time monitoring features |
US6149801A (en) * | 1997-08-08 | 2000-11-21 | Water Pik, Inc,. | Water treatment device with volumetric monitoring features |
US6284129B1 (en) | 1997-08-08 | 2001-09-04 | Water Pik, Inc. | Water treatment device with volumetric and time monitoring features |
US6517707B2 (en) | 1997-08-08 | 2003-02-11 | Water Pik, Inc. | Water treatment device with volumetric and time monitoring features |
US20030173273A1 (en) * | 1997-08-08 | 2003-09-18 | Giordano Edward C. | Water treatment device with volumetric and time monitoring features |
US6926821B2 (en) | 1997-08-08 | 2005-08-09 | Water Pik, Inc. | Water treatment device with volumetric and time monitoring features |
US20050098485A1 (en) * | 2003-10-01 | 2005-05-12 | Water Pik, Inc. | End-of-faucet filter |
US7326334B2 (en) | 2003-10-01 | 2008-02-05 | Instapure Brands, Inc. | End-of-faucet filter |
US20060226084A1 (en) * | 2005-04-08 | 2006-10-12 | Gross Donald P | Marine vessel liquid strainer clogging indicator and method |
US7491320B2 (en) | 2005-04-08 | 2009-02-17 | Gross Donald P | Marine vessel liquid strainer clogging indicator |
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