US4163769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High thermal conductivity substrate
Assignee: Brigham Young University
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Filing: 1978-04-03
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Granted: 1979-08-07
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Expires: 1998-04-03
Abstract
Abstract A high thermal conductivity substrate is formed by making a sintered diamond composite and thereafter modifying the electrical properties of the composite by leaching graphite and other non-diamond materials from the composite and subsequently infusing the leached composite with material having known electrical properties. Alternatively, a diamond composite having high thermal conductivity known electrical properties if prepared and subsequently leached to remove graphite and other materials which interfere with the known electrical properties of the composite material.
Inventors
- 👤 Bill J. Pope
- 👤 M. Duane Horton
- 👤 H. Tracy Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:39
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/20; H10W40/25; H10W40/254; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; H01; H01J; H01J9/00; H01J9/20; H10W99/00; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A method of making a high thermal conductivity substrate for use as a heat sink comprising the steps of: combining diamond particles with at least one diamond flat in a sample chamber and orienting the flat parallel to the longitudinal axis of the chamber so as to increase the thermal conductivity of the resulting substrate; sintering the combination of diamond particles and the diamond flat under elevated temperature and pressure conditions until a unitary polycrystalline diamond composite is formed; and leaching the graphite from the diamond composite so as to remove undesirable electrical conductivity properties of the composite.
Claim 2
Independent Claim
98 words
A method of making a high thermal conductivity substrate for use as a heat sink comprising the steps of: combining diamond particles with at least one diamond flat in a sample chamber and orienting the flat parallel to the longitudinal axis of the chamber so as to increase the thermal conductivity of the resulting substrate; sintering the combination of diamond particles and the diamond flat under elevated temperature and pressure conditions until a unitary polycrystalline diamond composite is formed; and leaching the graphite from the diamond composite so as to remove undesirable electrical conductivity properties of the composite.
Claim 3
Independent Claim
89 words
A method of making a high thermal conductivity substrate for use as a heat sink comprising the steps of: combining diamond particles of two different sizes in a sample chamber so as to increase the thermal conductivity of the resulting substrate, the size ratio being on the order of 5:1 to 100:1; sintering the combination of diamond particles under elevated temperature and pressure conditions until a unitary polycrystalline composite is formed; and leaching graphite from the diamond composite so as to remove undesirable electrical conductivity properties of the composite.
Claim 4
Independent Claim
89 words
A method of making a high thermal conductivity substrate for use as a heat sink comprising the steps of: combining diamond particles of two different sizes in a sample chamber so as to increase the thermal conductivity of the resulting substrate, the size ratio being on the order of 5:1 to 100:1; sintering the combination of diamond particles under elevated temperature and pressure conditions until a unitary polycrystalline composite is formed; and leaching graphite from the diamond composite so as to remove undesirable electrical conductivity properties of the composite.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |