US3793256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled curing pf poly(arylene sulfide)resins
Assignee: Phillips Petroleum Co
•
Filing: 1972-08-30
•
Granted: 1974-02-19
•
Expires: 1992-08-30
Abstract
Abstract THE MOLECULAR WEIGHT OF POLY(ARYLENE SULFIDE) RESINS CAN BE INCREASED BY HEAT TREATMENT UNDER OXIDIZING ATMOSPHERE AT AN ELEVATED TEMPERATURE BELOW THE MELTING POINT OF THE RESIN. THIS CURING REACTION CAN BE TERMINATED BY FLUSHING OUT THE OXIDIZING ATMOSPHERE WITH AN INERT GAS, SUCH AS STEAM AND THEN COOLING THE RESIN IN THE PRESENCE OF THE INERT GAS TO A TEMPERATURE AT WHICH NO SIGNIFICANT CURING WOULD BE ACCOMPLISHED IN AN OXIDIZING ATMOSPHERE. THE COOLING OF THE RESIN CAN THEN BE COMPLETED IN THE PRESENCE OF AIR.
Inventors
- 👤 J Scoggin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:29
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0286; C08G75/0295; C08J2381/00; C08J2381/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |