Patent US2418982A successfully refreshed from Google Patents.
Patent US2697029A successfully refreshed from Google Patents.
US2697029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of producing carbonized substances containing silicon
Assignee: AT&T Inc
•
Filing: 1951-04-28
•
Granted: 1954-12-14
•
Expires: 1971-04-28
Abstract
No abstract record available.
Inventors
- 👤 William O Baker
- 👤 Richard O Grisdale
- 👤 Field H Winslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:48
CPC Classifications
C; C08; C08F; C08F30/00; C08F30/04; C08F30/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD WHICH COMPRISES FORMING A BODY OF A POLYMER BY SUBJECTING TO ADDITION POLYMERIZATON, THROUGH UNSATURATED CARBON-TO-CARBON BONDS, A POLYMERIZABLE MATERIAL CONSISTING OF AT LEAST ONE MONOMER CONTAINING NONBENZENOID UNSATURATED CARBON-TO-CARBON BONDS, SAID POLYMERIZABLE MATERIAL HAVING AN AVERAGE FUNCTIONALITY OF ADDITION POLYMERIZATION OF AT LEAST 2.4, SADI POLYMERIZABLE MATERIAL CONSISTING ENTIRELY OF CARBON, HYDROGEN AND SILICON, THE SILICON BEING PRESENT IN AN AMOUNT UP TO 20 PER CENT BY WEIGHT OF THE CARBON, THE HYDROGEN BEING PRESENT IN AN AMOUNT GREATER THAN 5 PER CENT BY WEIGHT OF THE CARBON, HEATING SAID BODY IN AN OXYGEN-CONTAINING ATMOSPHERE AT A TEMPERATURE BETWEEN 200* C. AND 300* C. FOR AT LEAST TWO HOURS AND THEN THERMALLY DEHYDROGENATING SAID BODY BY HEATING IT IN A NON-OXIDIZING ATMOSPHERE TO A TEMPERATURE OF AT LEAST 850* C.
Claim 2
Independent Claim
133 words
THE METHOD WHICH COMPRISES FORMING A BODY OF A POLYMER BY SUBJECTING TO ADDITION POLYMERIZATON, THROUGH UNSATURATED CARBON-TO-CARBON BONDS, A POLYMERIZABLE MATERIAL CONSISTING OF AT LEAST ONE MONOMER CONTAINING NONBENZENOID UNSATURATED CARBON-TO-CARBON BONDS, SAID POLYMERIZABLE MATERIAL HAVING AN AVERAGE FUNCTIONALITY OF ADDITION POLYMERIZATION OF AT LEAST 2.4, SADI POLYMERIZABLE MATERIAL CONSISTING ENTIRELY OF CARBON, HYDROGEN AND SILICON, THE SILICON BEING PRESENT IN AN AMOUNT UP TO 20 PER CENT BY WEIGHT OF THE CARBON, THE HYDROGEN BEING PRESENT IN AN AMOUNT GREATER THAN 5 PER CENT BY WEIGHT OF THE CARBON, HEATING SAID BODY IN AN OXYGEN-CONTAINING ATMOSPHERE AT A TEMPERATURE BETWEEN 200* C. AND 300* C. FOR AT LEAST TWO HOURS AND THEN THERMALLY DEHYDROGENATING SAID BODY BY HEATING IT IN A NON-OXIDIZING ATMOSPHERE TO A TEMPERATURE OF AT LEAST 850* C.
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) | 1957-12-13 | 1958-06-14 | 1958-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-13 | 1962-06-14 | 1962-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-13 | 1966-06-14 | 1966-12-14 | $7700.00 | Window Closed / Lapsed |