Patent US3500103A successfully refreshed from Google Patents.
Patent US2961428A successfully refreshed from Google Patents.
US2961428A
Expired / Lapsed
US
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Polyacetal-polyisocyanate polymers
Assignee: Bayer AG
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Filing: 1956-10-18
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Granted: 1960-11-22
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Expires: 1976-10-18
Abstract
No abstract record available.
Inventors
- 👤 Muller Erwin
- 👤 Braun Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A POLYURETHANE PLASTIC WHICH COMPRISES THE REACTION PRODUCT OF (A) A POLYACETAL HAVING AT LEAST TWO HYDROXYL GROUPS PREPARED BY HEATING A POLYHYDRIC ALIPHATIC ALCOHOL AND A MEMBER SELECTED FROM THE CLASS CONSISTING OF
Claim 2
Dependent Claim
34 words
A POLYURETHANE PLASTIC WHICH COMPRISES THE REACTION PRODUCT OF (A) A POLYACETAL HAVING AT LEAST TWO HYDROXYL GROUPS PREPARED BY HEATING A POLYHYDRIC ALIPHATIC ALCOHOL AND A MEMBER SELECTED FROM THE CLASS CONSISTING OF
References Cited (Backward Citations)
FR956556A
Cited
US2071252A
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US2511544A
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US2277083A
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US2430479A
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US2692874A
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GB733624A
Cited
US2813776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |