Patent US3756992A successfully refreshed from Google Patents.
US3756992A
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Polyurethane polyelectrolytes and process for preparing same
Assignee: Bayer AG
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Filing: 1972-03-13
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Granted: 1973-09-04
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Expires: 1992-03-13
Abstract
Abstract POLYURETHANES ARE PREPARED BY DISPERSING SOLID OR LIQUID POLYURETHANE POLYELECTROLYTES CONTAINING METHYLOL GROUPS BY MIXING WITH WATER, SUBJECTING THE ELECTROLYTES TO A HEAT TREATMENT OF 25 TO 200*C. AND REMOVING THE WATER.
Inventors
- 👤 D Dieterich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:31
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; B; B60; B60W; B60W30/00; B60W30/18; B60W30/18009; B60W30/18145; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/10; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3829; C08G18/83; C08G18/84
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |