Patent US4230456A successfully refreshed from Google Patents.
Patent US3637909A successfully refreshed from Google Patents.
US3637909A
Expired / Lapsed
US
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Polyurethanes process and product prepared from aliphatic polycarbonates containing in situ polymerized unsaturated compounds
Assignee: Bayer AG
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Filing: 1969-07-09
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Granted: 1972-01-25
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Expires: 1989-07-09
Abstract
Abstract POLYURETHANES AND A PROCESS FOR PREPARING THEM IN WHICH POLYISOCYANATES ARE REACTED WITH ALIPHATIC POLYCARBONATES CONTAINING AT LEAST TWO HYDROXYL GROUPS AND HAVING A MOLECULAR WEIGHT OF 800 TO 3000, WHICH POLYCARBONATES HAVE BEEN PREPARED BY POLYMERIZING UNSATURATED COMPOUNDS IN SITU, IF DESIRED WITH FORMATION OF GRAFT POLYMERS. THE HYDROLYTICALLY STABLE POLYURETHANES OF THIS INVENTION ARE HIGHLY ADVANTAGEOUS FOR USE IN ANY APPLICATION IN WHICH HYDROLYTIC ONDITIONS MAY BE ENCOUNTERED SUCH AS, FOR EXAMPLE, BATHTUB MATS, KITCHEN AIDS, GEARS, MOLDED PARTS, GASKETS, O-RINGS, SHOE HEELS, SHOCK ABSORBERS AND SO ON.
Inventors
- 👤 Wulf Von Bonin
- 👤 Kuno Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6552; C08G18/40; C08G18/42; C08G18/44; C08G18/63; C08G18/631; C08G18/67; C08G18/675
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |