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Patent US3565863A successfully refreshed from Google Patents.
US3565863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular polyurethane resins
Assignee: Bayer AG
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Filing: 1965-09-15
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Granted: 1971-02-23
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Expires: 1985-09-15
Abstract
Abstract POLYURETHANE RESINS PREPARED BY REACTING A POLYOXYMETHYLENE WHICH HAS ALCOHOLIC HYDROXYL GROUPS BUT WHICH IS SUBSTANTIALLY FREE FROM SIMI-ACETALIC HYDROXYL GROUPS AND WHICH HAS A MOLECULAR WEIGHT IN THE RANGE OF 500 TO 4000 WITH AN ORGANIC POLYISOCYANATE AT A TEMPERATURE OF FROM 50*C. TO 200*C.
Inventors
- 👤 Hans-Georg Schmelzer
- 👤 Kuno Wagner
- 👤 Ernst-Ulrich Kocher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:11
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/18; C08G2/22; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/4009; C08G18/4036; C08G18/56; C08G4/00
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |