US3074894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cellular polyurethanes
Assignee: Bayer AG
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Filing: 1957-09-10
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Granted: 1963-01-22
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Expires: 1977-09-10
Abstract
No abstract record available.
Inventors
- 👤 Loew Gunther
- 👤 Thoma Wilhelm
- 👤 Bernhard Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:52
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/65; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
IN THE MANUFACTURE OF A CELLULAR POLYURETHANE BY A PROCESS WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE AND AN ORGANIC COMPOUND HAVING AT LEAST TWO REACTIVE HYDROGEN ATOMS, A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AN HYDROXYL NUMBER OF NOT MORE THAN ABOUT 224 AND AN ACID NUMBER OF NOT MORE THAN 2, SAID ORGANIC COMPOUND BEING REACTIVE WITH SAID POLYISOCLANATE TO FORM A POLYURETHANE, THE IMPROVEMENT WHICH COMPRISES REACTING THE SAID COMPONENTS TOGETHER WHILE IN ADMIXTURE WITH ABOUT 0.1 PERCENT TO ABOUT 20 PERCENT BY WEIGHT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF A DIALKYL CARBONATE, A DIALKYL PYROCARBONATE, AN ALKYL ORTHOCARBONATE, AN ACETALDEHYDE DIALKYL ACETAL, A MALONIC ALDEHYDE TETRAALKYL ACETAL, AN ACETONE DIALKYL KETAL, ETHYL ORTHOFORMATE AND ACETIMINO ETHYL ETHER.
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |