Patent US3297627A successfully refreshed from Google Patents.
US3297627A
Expired / Lapsed
US
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Thermostabilized copolymers of trioxane and process for preparing them using an imidazolidone-2 stabilizer
Assignee: Hoechst AG
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Filing: 1963-04-22
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Granted: 1967-01-10
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Expires: 1983-04-22
Abstract
No abstract record available.
Inventors
- 👤 Hermann Hans Dieter
- 👤 Roos Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:29
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3445
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A THERMALLY STABILIZED COPOLYMER OF TRIOXANE HAVING REPEATING UNITS CONSISTING ESSENTIALLY OF-OCH2-GROUPS INTERSPERSED WITH OXYALKYLENE GROUPS OF THE FORMULA
Claim 2
Dependent Claim
19 words
A THERMALLY STABILIZED COPOLYMER OF TRIOXANE HAVING REPEATING UNITS CONSISTING ESSENTIALLY OF-OCH2-GROUPS INTERSPERSED WITH OXYALKYLENE GROUPS OF THE FORMULA
Claim 3
Dependent Claim
55 words
A THERMALLY STABILIZED COPOLYMER OF TRIOXANE AS DEFINED IN CLAIN 1 CONTAINING, IN ADDITION, A KNOWN POLYOXYMETHYLENE STABILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF PHENOL, SUBSTITUTED PHENOLS HAVING A PK AT 25*C. OF GREATER THAN 6.0 FOR EVERY STAGE OF DISSOCIATION OF SAID SUBSTITUTED PHENOL, MONOMERIC SECONDARY AROMATIC AMINES AND MONOMERIC TERTIARY AROMATIC AMINES.
Claim 4
Dependent Claim
55 words
A THERMALLY STABILIZED COPOLYMER OF TRIOXANE AS DEFINED IN CLAIN 1 CONTAINING, IN ADDITION, A KNOWN POLYOXYMETHYLENE STABILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF PHENOL, SUBSTITUTED PHENOLS HAVING A PK AT 25*C. OF GREATER THAN 6.0 FOR EVERY STAGE OF DISSOCIATION OF SAID SUBSTITUTED PHENOL, MONOMERIC SECONDARY AROMATIC AMINES AND MONOMERIC TERTIARY AROMATIC AMINES.
References Cited (Backward Citations)
US2871220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |