US3632552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable poly(beta-lactone) polymers
Assignee: Shell USA Inc
•
Filing: 1968-12-20
•
Granted: 1972-01-04
•
Expires: 1988-12-20
Abstract
Abstract ANTIGASSING AGENTS (DESACTIVATORS) WHICH PREVENT "UNZIPPING" OF POLY(BETA-LACTONES) COMPRISE (1) ALPHA- OR BETA-ARYL- OR ALLYL-SUBSTITUTED ALKYL HALIDES, (2) COMPLEXES OF A BORON HALIDE AND A PHOSPHINE, (3) ARENEDIAZONIUM SALTS OF COMPLEX FLUORO ACIDS, (4) TROPYLIUM SALTS, (5) AMMONIA SALTS AND (6) DIHYLDROCARBYL SULFIDES.
Inventors
- 👤 Jacoba P E Smid
- 👤 Servaas Van Der Ven
- 👤 Hendrik Van Der Vliet
- 👤 Eduard M A A J Van Acker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:15
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |