Patent US3243389A successfully refreshed from Google Patents.
US3243389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making polyurethane plastics using aminourethane and aminourea catalysts
Assignee: Bayer AG
•
Filing: 1963-06-14
•
Granted: 1966-03-29
•
Expires: 1983-06-14
Abstract
No abstract record available.
Inventors
- 👤 Moller Friedrich
- 👤 Thoma Wilhelm
- 👤 Braun Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:18
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1841
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A METHOD FOR THE PREPARATION OF A POLYURETHANE WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN ATOMS AS DETERMINABLE BY THE ZEREWITINOFF METHOD IN A REACTION MIXTURE CONTAINING A CATALYTIC AMOUNT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF AMINOURETHANES AND AMINOUREAS, SAID CATALYST HAVING THE STRUCTURE
Claim 2
Independent Claim
53 words
A METHOD FOR THE PREPARATION OF A POLYURETHANE WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN ATOMS AS DETERMINABLE BY THE ZEREWITINOFF METHOD IN A REACTION MIXTURE CONTAINING A CATALYTIC AMOUNT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF AMINOURETHANES AND AMINOUREAS, SAID CATALYST HAVING THE STRUCTURE
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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |