US3342555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of light weight porous carbon
Assignee: Dow Chemical Co
•
Filing: 1961-06-19
•
Granted: 1967-09-19
•
Expires: 1981-06-19
Abstract
No abstract record available.
Inventors
- 👤 William J Mcmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:11
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/0022; C01; C01B; C01B32/00; C04B35/00; C04B35/515; C04B35/52; C04B35/524
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR THE PREPARATION OF A POROUS CARBON MATERIAL WHICH COMPRISES PREHEATING A FOAMED POLYMER IN AN INERT ATMOSPHERE TO 800*C. AT A RATE LESS THAN 20*C. TEMPERATURE RISE PER MINUTE AND THEREAFTER HEATING THE PREHEATED FOAM TO A TEMPERATURE IN THE RANGE OF 800* TO 1700*C., THEREBY TO CARBONIZE THE FOAM, SAID FOAMED POLYMER BEING FORMED BY INTERMIXING MONOMERS TO FORM A POLYMER HAVING BENZENE RINGS BONDED TOGETHER ON THE AVERAGE BY NOT LESS THAN 2.5 BONDS PER BENZENE MOLECULE BY BONDING GROUPS CONSISTING OF AT LEAST 65 PERCENT OF CARBON GROUPS NOT EXCEEDING ONE CARBON ATOM, FOAMING THE INTERMIXED MONOMERS INTO FINE CELLED FOAM, AND SUBJECTING THE FOAM TO A SUFFICIENT TEMPERATURE TO EFFECT THE POLYMERIZATION REACTION OF THE FOAMED MONOMERS TO FORM THE FOAMED POLYMER.
Claim 2
Dependent Claim
129 words
A PROCESS FOR THE PREPARATION OF A POROUS CARBON MATERIAL WHICH COMPRISES PREHEATING A FOAMED POLYMER IN AN INERT ATMOSPHERE TO 800*C. AT A RATE LESS THAN 20*C. TEMPERATURE RISE PER MINUTE AND THEREAFTER HEATING THE PREHEATED FOAM TO A TEMPERATURE IN THE RANGE OF 800* TO 1700*C., THEREBY TO CARBONIZE THE FOAM, SAID FOAMED POLYMER BEING FORMED BY INTERMIXING MONOMERS TO FORM A POLYMER HAVING BENZENE RINGS BONDED TOGETHER ON THE AVERAGE BY NOT LESS THAN 2.5 BONDS PER BENZENE MOLECULE BY BONDING GROUPS CONSISTING OF AT LEAST 65 PERCENT OF CARBON GROUPS NOT EXCEEDING ONE CARBON ATOM, FOAMING THE INTERMIXED MONOMERS INTO FINE CELLED FOAM, AND SUBJECTING THE FOAM TO A SUFFICIENT TEMPERATURE TO EFFECT THE POLYMERIZATION REACTION OF THE FOAMED MONOMERS TO FORM THE FOAMED POLYMER.
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |