US3117940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of dissolving polyurethanes
Assignee: Bayer Corp
•
Filing: 1960-11-14
•
Granted: 1964-01-14
•
Expires: 1980-11-14
Abstract
No abstract record available.
Inventors
- 👤 Wilbur R Mcelroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:45
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/18; C08J11/28; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/833; C08J2375/00; C08J2375/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
A METHOD OF LIQUEFYING A SOLID POLYURETHANE PLASTIC WHICH CONTAINS URETHANE GROUPS IN THE LINEAR CHAIN WHICH COMPRISES HEATING THE SAME WITH A PRIMARY AMINE TO A TEMPERATURE OF AT LEAST 70*C. AND CONTINUING SAID HEATING UNTIL SAID SOLID POLYURETHANE PLASTIC IS LIQUID.
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) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |