Patent US3302999A successfully refreshed from Google Patents.
US3302999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon foam
Assignee: Union Carbide Corp
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Filing: 1962-11-14
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Granted: 1967-02-07
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Expires: 1982-11-14
Abstract
No abstract record available.
Inventors
- 👤 Charles V Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:05
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/0022; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/382; C04B35/00; C04B35/515; C04B35/52; C04B35/524; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
A SYNTHETIC CARBON FOAM ARTICLE CHARACTERIZED BY A CARBON ATOM ARRANGEMENT IN A LATTICE SUBSTANTIALLY SIMILAR TO THAT OF CARBON ATOMS IN A POLYESTER-TYPE POLYURETHANE FOAM, A BULK DENSITY IN THE RANGE FROM ABOUT 0.03 GRAMS PER CUBIC CENTIMETER TO ABOUT 0.45 GRAMS PER CUBIC CENTIMETER, AN ASH CONTENT OF LESS THAN ABOUT 0.5 PERCENT BY WEIGHT, AND A THERMAL CONDUCTIVITY LESS THAN ABOUT 2 B.T.U./FT.2HR. (*F./FT.).
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |