US3054756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane plastic prepared from phosphorous containing isocyanates and compounds containing active hydrogen atoms
Assignee: Bayer AG
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Filing: 1959-03-16
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Granted: 1962-09-18
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Expires: 1979-03-16
Abstract
No abstract record available.
Inventors
- 👤 Holtschmidt Hans
- 👤 Braum Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:44
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/776; C08B; C08B1/00; C08B1/08; C08B1/10; C08B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR THE PREPARATION OF POLYURETHANE PLASTICS WHICH COMPRISES REACTING AN ORGANIC COMPOUND CONTAINING AT LEAST TWO ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD, SAID GROUPS BEING REACTIVE WITH AN -NCO GROUP, WITH AN ISOCYANATO PHOSPHOROUS COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
44 words
A PROCESS FOR THE PREPARATION OF POLYURETHANE PLASTICS WHICH COMPRISES REACTING AN ORGANIC COMPOUND CONTAINING AT LEAST TWO ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD, SAID GROUPS BEING REACTIVE WITH AN -NCO GROUP, WITH AN ISOCYANATO PHOSPHOROUS COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |