Patent US3136731A successfully refreshed from Google Patents.
US3136731A
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Method of preparing polyurethane with a delayed action catalyst
Assignee: Bayer AG
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Filing: 1962-03-06
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Granted: 1964-06-09
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Expires: 1982-03-06
Abstract
No abstract record available.
Inventors
- 👤 Piechota Helmut
- 👤 Bonin Wulf Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:32
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/165; B01J31/02; B01J31/0234; B01J31/0235; B01J31/0237; B01J31/04; B01J31/06; B01J31/12; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD OF MAKING POLYURETHANES WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN ORGANIC COMPOUND CONTAINING AT LEAST TWO ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZERREWITINOFF METHOD IN THE PRESENCE OF A CATALYST CAPABLE OF PROMOTING SAID REACTION WHICH IS SORBED ON AN ORGANIC SUPPORT HAVING A PARTICLE SIZE OF FROM ABOUT 0.01 TO ABOUT 7 MM. AND A DENSITY OF FROM ABOUT 0.01 TO ABOUT 0.6 KG./CM.3 SELECTED FROM THE GROUP CONSISTING OF POLYMETHYLMETHACRYLATE, POLYSTYRENE, POLYVINYL ACETATE, POLYVINYL CHLORIDE, COPOLYMERS OF METHYLMETHACRYLATE AND ETHYLACRYLATE AND COPOLYMERS OF METHYLMETHACRYLATE AND VINYL ACETATE.
Claim 2
Dependent Claim
23 words
THE METHOD OF CLAIM 8 WHEREIN SAID REACTION IS CARRIED OUT IN THE PRESENCE OF A BLOWING AGENT TO PRODUCE A POLYURETHANE FOAM.
References Cited (Backward Citations)
US2967834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |