US4466483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and means for conducting heat from electronic components and the like
Assignee: Power Devices Inc
•
Filing: 1980-07-14
•
Granted: 1984-08-21
•
Expires: 2000-07-14
Abstract
Abstract A heat conductive material in solid form which is readily excoriated whereby it can be applied by rubbing on the surface to which it is to be applied is formed, in the preferred form, by mixing finely divided heat conducting solids in a waxy material. That material is formed of waxes, or certain fats, and is solid in the range of normal room temperatures. In preferred form, it becomes molten at temperatures in that range just above normal room temperature at which heat generating electronic semi-conductor devices often operate. The mixture is applied at normal room temperature in sheet insulator form by rubbing, or at elevated temperature by painting. It is applied to the surfaces to be mated and across which heat is to be conducted whereupon the surfaces are mated with the coating between them.
Inventors
- 👤 Fred J. Whitfield
- 👤 Arthur T. Doyel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:00
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31801
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
For application to the surfaces of electronic apparatus, a heat conducting and electrically non-conducting material in sheet form at normal room temperature which includes a non-metallic sheet material other than wax having metal based heat conduction elements as an ingredient and wax exposed on both sides of the sheet which changes state between solid and a flowable state as an incident to change in temperature between normal room temperature and a temperature in the range above normal room temperature, and in the temperature range in which said electronic apparatus operates.
Claim 2
Dependent Claim
90 words
For application to the surfaces of electronic apparatus, a heat conducting and electrically non-conducting material in sheet form at normal room temperature which includes a non-metallic sheet material other than wax having metal based heat conduction elements as an ingredient and wax exposed on both sides of the sheet which changes state between solid and a flowable state as an incident to change in temperature between normal room temperature and a temperature in the range above normal room temperature, and in the temperature range in which said electronic apparatus operates.
Claim 3
Dependent Claim
83 words
For application to the surfaces of electronic apparatus, a heat conducting and electrically non-conducting fire retardant material in sheet form at room temperature having a central layer of plastic material filled with heat conducting elements and coated on both sides with a material which changes state between solid and a flowable state as an incident to change in temperature between normal room temperature and a temperature in the range above normal temperature and in the temperature range in which said electronic apparatus operates.
Claim 4
Dependent Claim
83 words
For application to the surfaces of electronic apparatus, a heat conducting and electrically non-conducting fire retardant material in sheet form at room temperature having a central layer of plastic material filled with heat conducting elements and coated on both sides with a material which changes state between solid and a flowable state as an incident to change in temperature between normal room temperature and a temperature in the range above normal temperature and in the temperature range in which said electronic apparatus operates.
Claim 5
Dependent Claim
14 words
The invention defined in claim 2 in which said layer of plastic is foraminous.
Claim 6
Dependent Claim
26 words
The invention defined in claim 2 which further comprises an electronic component the component having a surface in intimate contact with one side of said sheet.
References Cited (Backward Citations)
CA600823A
Cited
GB1086003A
Cited
US3391242A
Cited
US3476177A
Cited
US3467547A
Cited
US3586102A
Cited
US3972821A
Cited
US4139051A
Cited
US4151547A
Cited
US4237086A
Cited
US4266267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |