US3229145A - Adjustable precision spark gap - Google Patents

Adjustable precision spark gap Download PDF

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Publication number
US3229145A
US3229145A US234770A US23477062A US3229145A US 3229145 A US3229145 A US 3229145A US 234770 A US234770 A US 234770A US 23477062 A US23477062 A US 23477062A US 3229145 A US3229145 A US 3229145A
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United States
Prior art keywords
spark gap
electrode
gap
chamber
cap
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Expired - Lifetime
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US234770A
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Jensen Otto
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ABB Inc USA
ITE Circuit Breaker Co
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ITE Circuit Breaker Co
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Priority to US234770A priority Critical patent/US3229145A/en
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Assigned to BROWN BOVERI ELECTRIC INC.; A CORP OF DE reassignment BROWN BOVERI ELECTRIC INC.; A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: I-T-E IMPERIAL CORPORATION
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
    • H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0059—Arc discharge tubes

Definitions

  • This invention relates to a novel spark gap and more specifically relates to a novel adjustable precision spark gap which is contained within a high dielectric medium.
  • Spark gaps are well known to the art and have use, for example, as a firing means to initiate the operation of protective electrical devices in response to voltages which exceed some predetermined value.
  • spark gaps have extensive use in series capacitor protector schemes of the type shown in copending application Serial No. 259,181 filed February 18, 1963, in the name of Murray K. Price et al. entitled Constant Voltage Source for Operation of Series Capacitor Bank Protective Equipment and assigned to the assignee of the present invention.
  • the present invention provides a novel precision spark gap in which the gap is enclosed in a high dielectric medium such as sulphur hexafluoride at atmospheric pressure or higher than atmospheric pressure, with a novel micrometer adjustment means entering the wall of the container in a sealed manner to permit adjustment of the gap separation.
  • a high dielectric medium such as sulphur hexafluoride at atmospheric pressure or higher than atmospheric pressure
  • the provision of the high dielectric gas medium permits operation of the gap in a very low ambient ionization environment with random ionization due to cosmic radiation being held to a minimum. Accordingly, the gap when initially calibrated, will hold its calibration with great accuracy.
  • a micrometer adjustment is then introduced through a novel bellows whereby the high dielectric gas remains sealed in the container while still permitting adjustment of the gap separation.
  • a primary object of this invention is to provide a high precison spark gap.
  • Another object of this invention is to provide a novel spark gap which operates in a low ionization environment.
  • a further object of this invention is to provide a novel adjustable precision spark gap.
  • Another object of this invention is to provide a spark gap enclosed in a high dielectric gas where the gap separation is adjustable by means external of the spark gap housing.
  • FIGURE 1 shows a side cross-sectional view of a spark gap constructed in accordance with the present invention.
  • FIGURE 2 is a top plan view of the front portion of teh spark gap to illustrate the micrometer adjustment means.
  • the spark gap container is formed of a hollow porcelain insulator 10 which may be tubular which is sealed at either end by insulation caps 11 and 12 which are of any appropriate dielectric medium. Gaskets 11a and 1211 are secured between caps 11 and 12 respectively and insulator 10.
  • Cap 11 is secured to insulator 10 by means of bolts such as bolts 13 and 14 which pass through appropriate openings in cap 11 and threadably receive a clamping ring 15 which is drawn into engagement with shoulder 16 in insulator 10.
  • the clamping ring 15 is secured in place by an appropriate nut and washer arrangement such as nuts 17 and 18 and washers 19 and 20 respectively.
  • a similar clamping arrangement is provided for securing end cap 12 to insulator 10 which includes clamping ring 21 which is bolted against shoulder 22 in the insulator 10.
  • Cap 12 is formed with an inwardly extending section 23 which has an opening therethrough for receiving threaded bolt 24.
  • the left-hand end of bolt 24 is threaded into a threaded opening in electrode 25 with an appropriate sealing ring 26 forming a gas tight connection between electrode 25 and section 23.
  • the right-hand end of bolt 24 receives the two nuts 27 and 28 which are secured against the right-hand surface of cap 12 to hold electrode 25 in position.
  • End cap 11 has extending section 30 which has an opening therethrough for receiving the threaded bolt 31.
  • the threaded bolt 31' has a keyway 32 therein which receives key 33 carried by extension 30 whereby bolt 31 is movable along the axis of member 30 but it cannot be rotated.
  • the right-end end of bolt 31 is threadably receivedby insulation cap 40 and electrode 41 where a sealing gasket 42 forms a seal between the opposing surfaces of cap 40 and electrode 41.
  • a biasing spring 42 is then captured between the right-hand surface of cap 11 and the left-hand surface of cap 40 to bias electrode 41, cap 40 and. bolt 31 toward electrode 25.
  • the bolt 31 fits through a micrometer adjustment head 50 which is threaded onto bolt 31.
  • a retaining nut 51 which is tightened after the micrometer head 50 has been set holds the bolt 31 in its adjusted position.
  • the micrometer head 50 is calibrated with indicia 52, as best seen in FIGURE 2, which is rotatable with respect to a pointer 53 which is secured to cap 11 by screws 54 and 55.
  • a bellows 60 is then secured between caps 11 and 40 in any desired manner as by cementing so that the inner chamber 61 which contains the outer surfaces of electrodes 25 and 41 is isolated from areas internal of bellows 60.
  • caps 11 and 12 then have tapered plugs and 71 which may be removed to permit the introduction of a high dielectric gas such as sulphur hexafluoride into chamber 61 to completely fill chamber 61 with this gas at atmospheric pressure or higher.
  • a high dielectric gas such as sulphur hexafluoride
  • Appropriate securing means can secure plugs 70 and 71 with respect to caps 11 and 12 respectively after the filling operation has been completed.
  • the bolts 24 and 31 which are of conductive material serve as the terminals of the spark gap device, where the active gap electrodes are formed by electrodes 25 and 41 which are of an appropriate material for the purpose.
  • micrometer head 50 In order to adjust the spacing between electrodes 25 and 41, the nut 51 is loosened and micrometer head 50 is rotated. The rotation of micrometer head on threaded bolt 31 will cause bolt 31 to move axially whereby the axial position of electrode 41 changes with respect to the stationary electrode 25.
  • this adjustment may be carried out even though the chamber 61 is filled with gas. That is to say, the bellows arrangement 412 permits transmission of. adjusting motion through cap 11 while retaining the chamber 61 in a sealed condition.
  • a precision spark gap comprising a sealed chamber, a first electrode secured to a first wall of said chamber, and a second electrode secured to a second wall of said chamber; said chamber being filled with a high dielectric gas at approximately atmospheric pressure; said second electrode being secured to said chamber by an adjustable member; said adjustable member passing through an opening in said chamber and being axially movable through said opening in said chamber; the portion of said adjustable member extending into said chamber being secured to one end of a closed bellows; the other end of said bellows being secured to said chamber and enclosing said opening; said second electrode being external of the interior of said bellows whereby said adjustable member is operable from regions external of said sealed chamber and said sealed chamber is sealed from said opening by said bellows; said sealed chamber comprising a hollow tubular insulator enclosed at either end by respective first'and second end caps of insulation material; said first and second electrodes being secured to said first and second end caps respectively; said first and second end caps having central sections projecting inwardly of said tubular insulator; said first and

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  • Spark Plugs (AREA)

Description

Jan. 11, 1966 o. JENSEN 3,229,145
ADJUSTABLE PRECISION SPARK GAP Filed Nov. 1, 1962 INVENTOR. Q 0770 df/VSE/V United States Patent 3,229,145 ADJUSTABLE PRECISION SPARK GAP Otto Jensen, Malvern, Pa., assignor to I-T-E Circuit Breaker Company, Philadelphia, Pa., a corporation of Pennsylvania Filed Nov. 1, 1962, Ser. No. 234,770 1 Claim. (Cl. 313-146) This invention relates to a novel spark gap and more specifically relates to a novel adjustable precision spark gap which is contained within a high dielectric medium.
Spark gaps are well known to the art and have use, for example, as a firing means to initiate the operation of protective electrical devices in response to voltages which exceed some predetermined value. By way of example, spark gaps have extensive use in series capacitor protector schemes of the type shown in copending application Serial No. 259,181 filed February 18, 1963, in the name of Murray K. Price et al. entitled Constant Voltage Source for Operation of Series Capacitor Bank Protective Equipment and assigned to the assignee of the present invention.
Where precise operation of the spark gap is required, it must be possible to adjust the gap separation within very narrow limits. This problem is complicated by random ionization in the gap area due to cosmic radiation which afiects the consistency of the gap of calibration.
In order to circumvent random ionization, a common practice has been to purposely increase the radiation level within the gap enclosure by introducing a radioactive material and calibrating the gap at this increased ionization level. When this is done, random ionization due to cosmic radiation becomes a negligible influence on the gap calibration.
The present invention provides a novel precision spark gap in which the gap is enclosed in a high dielectric medium such as sulphur hexafluoride at atmospheric pressure or higher than atmospheric pressure, with a novel micrometer adjustment means entering the wall of the container in a sealed manner to permit adjustment of the gap separation.
The provision of the high dielectric gas medium permits operation of the gap in a very low ambient ionization environment with random ionization due to cosmic radiation being held to a minimum. Accordingly, the gap when initially calibrated, will hold its calibration with great accuracy.
A micrometer adjustment is then introduced through a novel bellows whereby the high dielectric gas remains sealed in the container while still permitting adjustment of the gap separation.
Accordingly, a primary object of this invention is to provide a high precison spark gap.
Another object of this invention is to provide a novel spark gap which operates in a low ionization environment.
A further object of this invention is to provide a novel adjustable precision spark gap.
Another object of this invention is to provide a spark gap enclosed in a high dielectric gas where the gap separation is adjustable by means external of the spark gap housing.
These and other objects of this invention will become apparent from the following description when taken in connection with the drawings, in which:
FIGURE 1 shows a side cross-sectional view of a spark gap constructed in accordance with the present invention.
FIGURE 2 is a top plan view of the front portion of teh spark gap to illustrate the micrometer adjustment means.
3,229,145 Patented Jan. 11, 1966 "ice Referring now to FIGURE 1, the spark gap container is formed of a hollow porcelain insulator 10 which may be tubular which is sealed at either end by insulation caps 11 and 12 which are of any appropriate dielectric medium. Gaskets 11a and 1211 are secured between caps 11 and 12 respectively and insulator 10.
Cap 11 is secured to insulator 10 by means of bolts such as bolts 13 and 14 which pass through appropriate openings in cap 11 and threadably receive a clamping ring 15 which is drawn into engagement with shoulder 16 in insulator 10. The clamping ring 15 is secured in place by an appropriate nut and washer arrangement such as nuts 17 and 18 and washers 19 and 20 respectively.
A similar clamping arrangement is provided for securing end cap 12 to insulator 10 which includes clamping ring 21 which is bolted against shoulder 22 in the insulator 10.
Cap 12 is formed with an inwardly extending section 23 which has an opening therethrough for receiving threaded bolt 24. The left-hand end of bolt 24 is threaded into a threaded opening in electrode 25 with an appropriate sealing ring 26 forming a gas tight connection between electrode 25 and section 23. The right-hand end of bolt 24 receives the two nuts 27 and 28 which are secured against the right-hand surface of cap 12 to hold electrode 25 in position.
End cap 11 has extending section 30 which has an opening therethrough for receiving the threaded bolt 31. The threaded bolt 31' has a keyway 32 therein which receives key 33 carried by extension 30 whereby bolt 31 is movable along the axis of member 30 but it cannot be rotated.
The right-end end of bolt 31 is threadably receivedby insulation cap 40 and electrode 41 where a sealing gasket 42 forms a seal between the opposing surfaces of cap 40 and electrode 41. A biasing spring 42 is then captured between the right-hand surface of cap 11 and the left-hand surface of cap 40 to bias electrode 41, cap 40 and. bolt 31 toward electrode 25.
In order to control the motion of electrode 41 to the right, the bolt 31 fits through a micrometer adjustment head 50 which is threaded onto bolt 31. A retaining nut 51 which is tightened after the micrometer head 50 has been set holds the bolt 31 in its adjusted position. The micrometer head 50 is calibrated with indicia 52, as best seen in FIGURE 2, which is rotatable with respect to a pointer 53 which is secured to cap 11 by screws 54 and 55.
A bellows 60 is then secured between caps 11 and 40 in any desired manner as by cementing so that the inner chamber 61 which contains the outer surfaces of electrodes 25 and 41 is isolated from areas internal of bellows 60.
Each of caps 11 and 12 then have tapered plugs and 71 which may be removed to permit the introduction of a high dielectric gas such as sulphur hexafluoride into chamber 61 to completely fill chamber 61 with this gas at atmospheric pressure or higher.
Appropriate securing means can secure plugs 70 and 71 with respect to caps 11 and 12 respectively after the filling operation has been completed.
In operation, the bolts 24 and 31 which are of conductive material serve as the terminals of the spark gap device, where the active gap electrodes are formed by electrodes 25 and 41 which are of an appropriate material for the purpose.
In order to adjust the spacing between electrodes 25 and 41, the nut 51 is loosened and micrometer head 50 is rotated. The rotation of micrometer head on threaded bolt 31 will cause bolt 31 to move axially whereby the axial position of electrode 41 changes with respect to the stationary electrode 25.
This motion is permitted by bellows 60 and is in opposition to compression spring 42 which has a fully extended length considerably in excess of the maximum travel of electrode 41. Once the calibrated position is achieved, nut 51 is tightened.
It is to be particularly noted that this adjustment may be carried out even though the chamber 61 is filled with gas. That is to say, the bellows arrangement 412 permits transmission of. adjusting motion through cap 11 while retaining the chamber 61 in a sealed condition.
Although this invention has been described with respect to preferred embodiments thereof, it should be understood that many variations and modifications will now be obvious to those skilled in the art, and it is preferred, therefore, that the scope of this invention be limited not by specific disclosure herein but only by the appended claim.
- What is claimed is: I
A precision spark gap comprising a sealed chamber, a first electrode secured to a first wall of said chamber, and a second electrode secured to a second wall of said chamber; said chamber being filled with a high dielectric gas at approximately atmospheric pressure; said second electrode being secured to said chamber by an adjustable member; said adjustable member passing through an opening in said chamber and being axially movable through said opening in said chamber; the portion of said adjustable member extending into said chamber being secured to one end of a closed bellows; the other end of said bellows being secured to said chamber and enclosing said opening; said second electrode being external of the interior of said bellows whereby said adjustable member is operable from regions external of said sealed chamber and said sealed chamber is sealed from said opening by said bellows; said sealed chamber comprising a hollow tubular insulator enclosed at either end by respective first'and second end caps of insulation material; said first and second electrodes being secured to said first and second end caps respectively; said first and second end caps having central sections projecting inwardly of said tubular insulator; said first and second electrodes being "carried at the ends of said first and second inwardly projecting sections respectively; said adjustable member extending through said inwardly projecting section of said second end cap; terminals for said first and second electrodes extending through said first and second inwardly projecting sections; said terminal for said first electrode comprising a threaded bolt for securing said first electrode to said end of said first inwardly projecting section of said first end cap; said terminal for said second electrode comprising said adjustable member; said adjustable member having a threaded end for threadably receiving said second electrode; andmicrometer adjustment means threadably secured to the end of said adjustable member extending out of said sealed chamber; the interior of said bellows receiving a compression spring to bias the ends of said bellows away from one another.
References Cited by the Examiner OTHER REFERENCES Pub., Lingal, H. 1., and Owens, J. B.: A New High Voltage Outdoor Load Interrupter Switch. In A.I.E.E. Transactions, 1953, Vol. 72, Part III; pages 293-295.
GEORGE N. WESTBY, Primary Examiner.
US234770A 1962-11-01 1962-11-01 Adjustable precision spark gap Expired - Lifetime US3229145A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319121A (en) * 1965-03-08 1967-05-09 Gen Electric Means comprising a triggered vacuum circuit interrupter for protection against overvoltages
US3346751A (en) * 1963-10-01 1967-10-10 Engelhard Hanovia Inc Clamped seal for high pressure gas discharge lamp
US3400290A (en) * 1965-08-25 1968-09-03 Dresser Ind Static atmosphere ion beam accelerator having a movable target
US3474287A (en) * 1966-07-15 1969-10-21 Westinghouse Electric Corp High power,nonlinear,gas tube resistor
US3480821A (en) * 1967-12-18 1969-11-25 Gen Electric Stabilized vacuum gap device with elementary electrode structure
US3488465A (en) * 1965-09-27 1970-01-06 English Electric Co Ltd Capacitor protecting switching devices with raised contacts on coaxial electrodes,and air blast extinction means
US3513516A (en) * 1965-03-16 1970-05-26 Signalite Inc Adjustable electrode spark gap assembly
US3517248A (en) * 1967-10-23 1970-06-23 Us Navy Pressure control of electrode position in gas tube
US3571746A (en) * 1968-01-10 1971-03-23 Us Navy Pulsed laser apparatus
US3736453A (en) * 1971-01-22 1973-05-29 California Inst Of Techn Arc control in compact arc lamps
US3867663A (en) * 1973-05-14 1975-02-18 Boeing Co Wide range pressure controlled spark gap
US3912965A (en) * 1970-12-14 1975-10-14 Naoya Yamada Spark gap device for lightning arrester
US3997807A (en) * 1975-05-27 1976-12-14 Rca Corporation Mechanically adjustable electron gun apparatus
FR2445450A1 (en) * 1978-12-26 1980-07-25 Bordelles Christian Ignition converter for enhancing IC engine firing characteristics - has mica chip between facing metal tablets enclosed by cylindrical plastics casing
US4283747A (en) * 1978-12-21 1981-08-11 Western Electric Co., Inc. Methods of making a gas tube surge protector
EP2930354A1 (en) * 2014-04-10 2015-10-14 Nordex Energy GmbH Wind energy turbine rotor blade with a lightning protection conductor
EP2930356A1 (en) * 2014-04-10 2015-10-14 Nordex Energy GmbH Wind energy turbine rotor blade with a lightning protection conductor

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1022192A (en) * 1911-04-27 1912-04-02 Cassius C Van Wagoner Attachment to spark-plugs.
US2457102A (en) * 1941-02-17 1948-12-21 Mini Of Supply Spark gap
US2540399A (en) * 1949-07-28 1951-02-06 Bendix Aviat Corp Spark gap
US2670451A (en) * 1950-01-12 1954-02-23 Westinghouse Electric Corp Short arc high-pressure vapor discharge lamp
US2691742A (en) * 1951-08-24 1954-10-12 Westinghouse Electric Corp Lightning arrester
US2703374A (en) * 1951-01-15 1955-03-01 Fruengel Frank Stroboscopic light source
US2717974A (en) * 1952-04-08 1955-09-13 Wihtol Weltis Disc type electron tube with improved cathode, grid, and anode elements
US2740915A (en) * 1954-10-18 1956-04-03 Jennings Radio Mfg Corp Adjustable spark gap
US2778967A (en) * 1952-05-16 1957-01-22 Bendix Aviat Corp Spark gap
US2866119A (en) * 1957-03-11 1958-12-23 Jennings Radio Mfg Corp Adjustable discharge tube
US2958805A (en) * 1959-12-04 1960-11-01 Dale Products Inc Gap-type lightning arresters

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1022192A (en) * 1911-04-27 1912-04-02 Cassius C Van Wagoner Attachment to spark-plugs.
US2457102A (en) * 1941-02-17 1948-12-21 Mini Of Supply Spark gap
US2540399A (en) * 1949-07-28 1951-02-06 Bendix Aviat Corp Spark gap
US2670451A (en) * 1950-01-12 1954-02-23 Westinghouse Electric Corp Short arc high-pressure vapor discharge lamp
US2703374A (en) * 1951-01-15 1955-03-01 Fruengel Frank Stroboscopic light source
US2691742A (en) * 1951-08-24 1954-10-12 Westinghouse Electric Corp Lightning arrester
US2717974A (en) * 1952-04-08 1955-09-13 Wihtol Weltis Disc type electron tube with improved cathode, grid, and anode elements
US2778967A (en) * 1952-05-16 1957-01-22 Bendix Aviat Corp Spark gap
US2740915A (en) * 1954-10-18 1956-04-03 Jennings Radio Mfg Corp Adjustable spark gap
US2866119A (en) * 1957-03-11 1958-12-23 Jennings Radio Mfg Corp Adjustable discharge tube
US2958805A (en) * 1959-12-04 1960-11-01 Dale Products Inc Gap-type lightning arresters

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3346751A (en) * 1963-10-01 1967-10-10 Engelhard Hanovia Inc Clamped seal for high pressure gas discharge lamp
US3319121A (en) * 1965-03-08 1967-05-09 Gen Electric Means comprising a triggered vacuum circuit interrupter for protection against overvoltages
US3513516A (en) * 1965-03-16 1970-05-26 Signalite Inc Adjustable electrode spark gap assembly
US3400290A (en) * 1965-08-25 1968-09-03 Dresser Ind Static atmosphere ion beam accelerator having a movable target
US3488465A (en) * 1965-09-27 1970-01-06 English Electric Co Ltd Capacitor protecting switching devices with raised contacts on coaxial electrodes,and air blast extinction means
US3474287A (en) * 1966-07-15 1969-10-21 Westinghouse Electric Corp High power,nonlinear,gas tube resistor
US3517248A (en) * 1967-10-23 1970-06-23 Us Navy Pressure control of electrode position in gas tube
US3480821A (en) * 1967-12-18 1969-11-25 Gen Electric Stabilized vacuum gap device with elementary electrode structure
US3571746A (en) * 1968-01-10 1971-03-23 Us Navy Pulsed laser apparatus
US3571745A (en) * 1968-01-10 1971-03-23 Us Navy Pulse-charging coupling laser apparatus
US3912965A (en) * 1970-12-14 1975-10-14 Naoya Yamada Spark gap device for lightning arrester
US3736453A (en) * 1971-01-22 1973-05-29 California Inst Of Techn Arc control in compact arc lamps
US3867663A (en) * 1973-05-14 1975-02-18 Boeing Co Wide range pressure controlled spark gap
US3997807A (en) * 1975-05-27 1976-12-14 Rca Corporation Mechanically adjustable electron gun apparatus
US4283747A (en) * 1978-12-21 1981-08-11 Western Electric Co., Inc. Methods of making a gas tube surge protector
FR2445450A1 (en) * 1978-12-26 1980-07-25 Bordelles Christian Ignition converter for enhancing IC engine firing characteristics - has mica chip between facing metal tablets enclosed by cylindrical plastics casing
EP2930354A1 (en) * 2014-04-10 2015-10-14 Nordex Energy GmbH Wind energy turbine rotor blade with a lightning protection conductor
EP2930356A1 (en) * 2014-04-10 2015-10-14 Nordex Energy GmbH Wind energy turbine rotor blade with a lightning protection conductor

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Owner name: BROWN BOVERI ELECTRIC INC.; SPRING HOUSE, PA. 1947

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:I-T-E IMPERIAL CORPORATION;REEL/FRAME:004103/0790

Effective date: 19820428