Patent US3272780A successfully refreshed from Google Patents.
US3272780A
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Copolymers of trioxane, another aldehyde having at least two carbon atoms and optionally a third comonomer
Assignee: British Industrial Plastics Ltd
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Filing: 1961-10-13
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Granted: 1966-09-13
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Expires: 1981-10-13
Abstract
No abstract record available.
Inventors
- 👤 Wilson Walter
- 👤 May Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:21
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08G2/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
37 words
A PROCESS FOR THE PREPARATION OF A COPOLYMER WHICH COMPRISES REACTIN TRIOXAN WITH AN ALDEHYDE THAT YIELDS A COPOLYMER HAVIN AT LEAST 2 CARBON ATOMS UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND IN THE PRESENCE OF AN ELECTROPHILIC CATALYST.
Claim 2
Dependent Claim
37 words
A PROCESS FOR THE PREPARATION OF A COPOLYMER WHICH COMPRISES REACTIN TRIOXAN WITH AN ALDEHYDE THAT YIELDS A COPOLYMER HAVIN AT LEAST 2 CARBON ATOMS UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND IN THE PRESENCE OF AN ELECTROPHILIC CATALYST.
Claim 3
Dependent Claim
52 words
A PROCESS AS CLAIMED IN CLAIM 1 IN WHICH TRIOXAN IS REACTED WITH AN ALDEHYDE AND A COMPOUND CAPABLE OF COPOLYMERIZING WITH TRIOXAN IN THE PRESENCE OF AN ELECTROPHILIC CATALYST, THE COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF A CYCLIC ETHER, A VINYL COMPOUND, AN ALLYL ETHER AND AN ALLYL ESTER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |