US3387940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength carbon foam
Assignee: Union Carbide Corp
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Filing: 1963-08-29
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Granted: 1968-06-11
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Expires: 1983-08-29
Abstract
No abstract record available.
Inventors
- 👤 Edgar R Mchenry
- 👤 Ervin L Piper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524; C08J2375/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
125 words
METHOD FOR PRODUCING A RELATIVELY HIGH STRENGTH CARBON FOAM WHICH COMPRISES INCORPORATING INTO A RIGID POLYESTER-TYPE POLYURETHANE FOAM DURING ITS MANUFACTURE A FINELY-DIVIDED CARBONACEOUS FILLER; MAINTAINING THE RESULTING FOAM FOR A PREDETERMINED TIME PERIOD SUFFICIENT TO INCREASE THE DEGREE OF CROSS-LINKING OF THE POLYMERS THEREIN AT AN ELEVATED TEMPERATURE UP TO ABOUT 200*C. AND IN AN OXYGEN-CONTAINING ATMOSPHERE; THEREAFTER MAINTAINING SAID RESULTING FOAM IN AN OXYGEN-CONTAINING ATMOSPHERE AT A TEMPERATURE IN THE RANGE FROM ABOUT 200*C. TO ABOUT 255*C. UNTIL SAID RESULTING FOAM SUSTAINS A WEIGHT LOSS OF AT LEAST ABOUT 3.5 PERCENT; AND MAINTAINING THE RESULTING FOAM AT A TEMPERATURE IN THE RANGE FROM ABOUT 500*C. TO ABOUT 1000*C. AND IN AN OXYGEN-FREE ATMOSPHERE FOR A SUFFICIENT TIME PERIOD TO PRODUCE A CARBON FOAM.
Claim 2
Dependent Claim
125 words
METHOD FOR PRODUCING A RELATIVELY HIGH STRENGTH CARBON FOAM WHICH COMPRISES INCORPORATING INTO A RIGID POLYESTER-TYPE POLYURETHANE FOAM DURING ITS MANUFACTURE A FINELY-DIVIDED CARBONACEOUS FILLER; MAINTAINING THE RESULTING FOAM FOR A PREDETERMINED TIME PERIOD SUFFICIENT TO INCREASE THE DEGREE OF CROSS-LINKING OF THE POLYMERS THEREIN AT AN ELEVATED TEMPERATURE UP TO ABOUT 200*C. AND IN AN OXYGEN-CONTAINING ATMOSPHERE; THEREAFTER MAINTAINING SAID RESULTING FOAM IN AN OXYGEN-CONTAINING ATMOSPHERE AT A TEMPERATURE IN THE RANGE FROM ABOUT 200*C. TO ABOUT 255*C. UNTIL SAID RESULTING FOAM SUSTAINS A WEIGHT LOSS OF AT LEAST ABOUT 3.5 PERCENT; AND MAINTAINING THE RESULTING FOAM AT A TEMPERATURE IN THE RANGE FROM ABOUT 500*C. TO ABOUT 1000*C. AND IN AN OXYGEN-FREE ATMOSPHERE FOR A SUFFICIENT TIME PERIOD TO PRODUCE A CARBON FOAM.
Claim 3
Dependent Claim
14 words
A HIGH-STRENGTH, POLYURETHANE-DERIVED CARBON FOAM PRODUCED IN ACCORDANCE WITH THE METHOD OF CLAIM 1.
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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |