Patent US3000850A successfully refreshed from Google Patents.
US3000850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bridged ring phosphite stabilizers for vinyl resins
Assignee: Celanese Corp
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Filing: 1959-08-10
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Granted: 1961-09-19
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Expires: 1979-08-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Bruce S Ainsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:41
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
IN A PROCESS FOR STABILIZING A HALOGENATED VINYL RESIN AGAINST HEAT DEGRADATION THE STEPS WHICH COMPRISE ADMIXING SAID VINYL RESIN AND A SMALL AMOUNT OF A BRIDGED-RING PHOSPHITE ESTER HAVING A CARBON ATOM DIRECTLY ATTACHED TO THE CARBON ATOMS OF THREE OXYMETHYLENE GROUPS AND EACH OF THE OXYGEN ATOMS OF SAID THREE OXYMETHYLENE GROUPS BEING DIRECTLY ATTACHED TO THE SAME TRIVALENT PHOSPHORUS ATOM.
Claim 2
Dependent Claim
63 words
IN A PROCESS FOR STABILIZING A HALOGENATED VINYL RESIN AGAINST HEAT DEGRADATION THE STEPS WHICH COMPRISE ADMIXING SAID VINYL RESIN AND A SMALL AMOUNT OF A BRIDGED-RING PHOSPHITE ESTER HAVING A CARBON ATOM DIRECTLY ATTACHED TO THE CARBON ATOMS OF THREE OXYMETHYLENE GROUPS AND EACH OF THE OXYGEN ATOMS OF SAID THREE OXYMETHYLENE GROUPS BEING DIRECTLY ATTACHED TO THE SAME TRIVALENT PHOSPHORUS ATOM.
References Cited (Backward Citations)
US2456216A
Cited
US2643261A
Cited
FR1119752A
Cited
US2752319A
Cited
US2841606A
Cited
US2841608A
Cited
US2867594A
Cited
US2834798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |