US3188296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyurethane plastics
Assignee: Bayer AG
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Filing: 1963-09-30
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Granted: 1965-06-08
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Hoppe Peter
- 👤 Weinbrenner Erwin
- 👤 Muhlhausen Cornelius
- 👤 Breer Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:01
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/002; B29B7/74; B29B7/7476; B29B7/7485; B29C; B29C45/00; B29C45/0001; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0895; C08J; C08J9/00; C08J9/30; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A PROCESS WHICH COMPRISES MIXING AN ORGANIC POLYISOCYANATE, AN ORGANIC COMPOUND HAVING AT LEAST TWO REACTIVE HYDROGEN ATOMS AND AN INERT GAS AND ALLOWING THE RESULTING MIXTURE TO REACT TO FORM A CELLULAR POLYURETHANE THE INERT GAS BEING ADDED AS A STREAM OF COMPRESSED GAS AND BEING SUBSTANTIALLY UNIFORMLY DISPERSED IN THE SAID MIXTURE, SAID ORGANIC COMPOUND BEING CAPABLE OF FORMING A POLYURETHANE BY REACTION WITH SAID ORGANIC POLYISOCYANATE AND HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AND HYDROXYL NUMBER OF NOT MORE THAN ABOUT 224 AND AN ACID NUMBER OF NOT MORE THAN ABOUT 2.
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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |