US3050475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyurethane plastics using schiff's base catalysts
Assignee: Bayer AG
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Filing: 1961-05-18
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Granted: 1962-08-21
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Expires: 1981-05-18
Abstract
No abstract record available.
Inventors
- 👤 Muller Erwin
- 👤 Wiegand Christian
- 👤 Braun Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:56
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1858
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN THE MANUFACTURE OF A CELLULAR POLYURETHANE PLASTIC BY A PROCESS WHICH COMPRISES REACTRING AN ORGANIC POLYISOCYANATE WITH WATER AND AN ORGANIC COMPOUND HAVING A PLURALITY OF HYDROXYL GROUPS REACTIVE WITH AN -NCO GROUP, SAID ORGANIC COMPOUND BEING CAPABLE OF FORMING A POLYURETHANE BY REACTION WITH AN ORGANIC POLYISOCYANATE, THE METHOD OF MAKING AN ELASTIC CELLULAR POLYURETHANE PLASTIC WHICH COMPRISES REACTING THE ORGANIC POLYISOCYANATE WITH WATER AND AN ORGANIC COMPOUND HAVING HYDROXYL GROUPS REACTIVE WITH AN -NCO GROUP AND HAVING AN HYDROXYL NUMBER BELOW 150 IN THE PRESENCE OF A SCHIFF''S BASE HAVING A TERTIARY NITROGEN ATOM.
Claim 2
Dependent Claim
97 words
IN THE MANUFACTURE OF A CELLULAR POLYURETHANE PLASTIC BY A PROCESS WHICH COMPRISES REACTRING AN ORGANIC POLYISOCYANATE WITH WATER AND AN ORGANIC COMPOUND HAVING A PLURALITY OF HYDROXYL GROUPS REACTIVE WITH AN -NCO GROUP, SAID ORGANIC COMPOUND BEING CAPABLE OF FORMING A POLYURETHANE BY REACTION WITH AN ORGANIC POLYISOCYANATE, THE METHOD OF MAKING AN ELASTIC CELLULAR POLYURETHANE PLASTIC WHICH COMPRISES REACTING THE ORGANIC POLYISOCYANATE WITH WATER AND AN ORGANIC COMPOUND HAVING HYDROXYL GROUPS REACTIVE WITH AN -NCO GROUP AND HAVING AN HYDROXYL NUMBER BELOW 150 IN THE PRESENCE OF A SCHIFF''S BASE HAVING A TERTIARY NITROGEN ATOM.
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) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |