US3353978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-extinguishing pitch foams
Assignee: United States Steel Corp
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Filing: 1964-08-14
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Granted: 1967-11-21
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Expires: 1984-08-14
Abstract
No abstract record available.
Inventors
- 👤 William R Davie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:04
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/14; C; C08; C08J; C08J9/00; C08J9/02; C10; C10C; C10C3/00; C10C3/14; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS COMPRISING HEATING AN AROMATIC PITCH HAVING A HYDROGEN TO CARBON RATIO OF LESS THAN 1:1 TO AT LEAST 150*C. IN THE PRESENCE OF SUFFICIENT SULFUR TO FOAM THE COMPOSITION AND PERMITTING SAID COMPOSITION TO FOAM AND COOLING WHILE RETAINING THE VOIDS THEREIN TO FORM A SOLID, THERMOPLASTIC, SELF-EXTINGUISHING FOAM.
Claim 2
Dependent Claim
51 words
A PROCESS COMPRISING HEATING AN AROMATIC PITCH HAVING A HYDROGEN TO CARBON RATIO OF LESS THAN 1:1 TO AT LEAST 150*C. IN THE PRESENCE OF SUFFICIENT SULFUR TO FOAM THE COMPOSITION AND PERMITTING SAID COMPOSITION TO FOAM AND COOLING WHILE RETAINING THE VOIDS THEREIN TO FORM A SOLID, THERMOPLASTIC, SELF-EXTINGUISHING FOAM.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |