US3626252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature equalization for printed circuits
Assignee: Keithley Instruments LLC
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Filing: 1970-01-21
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Granted: 1971-12-07
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Expires: 1990-01-21
Abstract
Abstract Leads of various electronic devices which are mounted on a printed circuit board each form a junction with the conductive pattern on the printed circuit at a different location, and temperature variations at these junctions may cause undesirable effects in the electrical circuit in which the devices are employed. Thermally-produced effects that result when the junctions of a printed circuit are at different temperatures are substantially eliminated by a thermally-conductive, electricallyinsulating substance, such as silicone grease, which contacts the leads and the conductive pattern. The thermally-conductive silicone grease is contained in a grease container formed of a rubber ''''0'''' ring and an aluminum disk. The rubber ''''0'''' ring encircles the grease and is pressed against one side of a printed circuit board, which contains a conductive pattern, by the aluminum disk which is secured to the board.
Inventors
- 👤 Pieter G Cath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:34
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/2039; H05K7/205; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/4913
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
65 words
An electrical apparatus comprising electronic circuit means having a plurality of electrical leads and a printed circuit conductive pattern, said leads being joined to the conductive pattern at junctions, a substantially thermally-conductive, electrically-insulating substance contacting said conductive pattern and said leads at selected junctions thereof and extending between said selected junctions to thermally connect said junctions and to substantially equalize the temperature of the junctions.
Claim 2
Dependent Claim
65 words
An electrical apparatus comprising electronic circuit means having a plurality of electrical leads and a printed circuit conductive pattern, said leads being joined to the conductive pattern at junctions, a substantially thermally-conductive, electrically-insulating substance contacting said conductive pattern and said leads at selected junctions thereof and extending between said selected junctions to thermally connect said junctions and to substantially equalize the temperature of the junctions.
Claim 3
Dependent Claim
16 words
An electrical apparatus as defined in claim 1 wherein the thermally-conductive substance is a silicone grease.
Claim 4
Dependent Claim
65 words
An electrical apparatus as defined in claim 1 wherein a thermally-conductive metal member is disposed adjacent to the conductive pattern of the printed circuit and an electrically-insulating member is disposed between the metal member and the conductive pattern to form with the metal member a container for said substance, said said substance filling said container, and means for securing said container to said conductive pattern.
Claim 5
Dependent Claim
49 words
An electrical apparatus as defined in claim 1 wherein said electronic circuit means comprises a plurality of semiconductor devices connected into a common circuit and each having leads forming junctions with said conductive pattern, said substance extending between and thermally connecting said junctions of the leads of said devices.
Claim 6
Dependent Claim
16 words
An electrical apparatus as defined in claim 3 wherein the thermally-conductive substance is a silicone grease.
Claim 7
Dependent Claim
16 words
An electrical apparatus as defined in claim 4 wherein the thermally-conductive substance is a silicone grease.
Claim 8
Dependent Claim
64 words
An electrical apparatus as defined in claim 4 wherein a thermally-conductive metal member is disposed adjacent to the conductive pattern of the printed circuit and an electrically-insulating member is disposed between the metal member and the conductive pattern to form with the metal member a container for said substance, said substance filling said container, and means for securing said container to said conductive pattern.
Claim 9
Dependent Claim
16 words
An electrical apparatus as defined in claim 3 wherein the thermally-conductive substance is a silicone grease.
Claim 10
Dependent Claim
85 words
An electrical apparatus comprising electronic circuit means having a plurality of leads and a printed circuit conductive pattern, said leads and the printed circuit conductive pattern being formed of different metals and said leads being joined to the conductive pattern at junctions, said different metals constituting thermoelectric junctions where they contact one another, a substantially thermally-conductive, electrically-insulating substance contacting said conductive pattern and said leads at said junctions and extending between said selected junctions to thermally connect said junctions and substanTially equalize the temperatures thereof.
Claim 11
Dependent Claim
85 words
An electrical apparatus comprising electronic circuit means having a plurality of leads and a printed circuit conductive pattern, said leads and the printed circuit conductive pattern being formed of different metals and said leads being joined to the conductive pattern at junctions, said different metals constituting thermoelectric junctions where they contact one another, a substantially thermally-conductive, electrically-insulating substance contacting said conductive pattern and said leads at said junctions and extending between said selected junctions to thermally connect said junctions and substanTially equalize the temperatures thereof.
Claim 12
Dependent Claim
16 words
An electrical apparatus as defined in claim 9 wherein the thermally-conductive substance is a silicone grease.
Claim 13
Dependent Claim
64 words
An electrical apparatus as defined in claim 9 wherein a thermally-conductive metal member is disposed adjacent to the conductive pattern of the printed circuit and an electrically-insulating member is disposed between the metal member and the conductive pattern to form with the metal member a container for said substance, said substance filling said container, and means for securing said container to said conductive pattern.
Claim 14
Dependent Claim
49 words
An electrical apparatus as defined in claim 9 wherein said electronic circuit means comprises a plurality of semiconductor devices connected into a common circuit and each having leads forming junctions with said conductive pattern, said substance extending between and thermally connecting said junctions of the leads of said devices.
Claim 15
Dependent Claim
16 words
An electrical apparatus as defined in claim 12 wherein the thermally-conductive substance is a silicone grease.
Claim 16
Dependent Claim
64 words
An electrical apparatus as defined in claim 12 wherein a thermally-conductive metal member is disposed adjacent to the conductive pattern of the printed circuit and an electrically-insulating member is disposed between the metal member and the conductive pattern to form with the metal member a container for said substance, said substance filling said container, and means for securing said container to said conductive pattern.
Claim 17
Dependent Claim
16 words
An electrical apparatus as defined in claim 14 wherein the thermally-conductive substance is a silicone grease.
Claim 18
Independent Claim
73 words
A method of eliminating thermally-produced effects in printed circuits which are caused by temperature differences between junctions of the printed circuit, the junctions being formed at the connection points of the leads of electronic devices that are utilized in the circuit and the conductive pattern of the printed circuit, comprising thermally connecting a plurality of the junctions of the printed circuit by a greaselike thermally-conductive electrically-insulating substance to substantially equalize the temperature therebetween.
Claim 19
Independent Claim
73 words
A method of eliminating thermally-produced effects in printed circuits which are caused by temperature differences between junctions of the printed circuit, the junctions being formed at the connection points of the leads of electronic devices that are utilized in the circuit and the conductive pattern of the printed circuit, comprising thermally connecting a plurality of the junctions of the printed circuit by a greaselike thermally-conductive electrically-insulating substance to substantially equalize the temperature therebetween.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |