US3761439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polyurethanes soluble in methyl ethyl ketone based on poly caprolactone diols
Assignee: Union Carbide Corp
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Filing: 1971-10-15
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Granted: 1973-09-25
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Expires: 1991-10-15
Abstract
Abstract THIS INVENTION RELATES O IMPROVED THERMOPLASTIC POLYURETHANES WHICH ARE SOLUBLE IN METHYL ETHYL KETONE AT ROOM TEMPERATURE. SUCH POLYURETHANES EXHIBIT IMPROVED ELEVATED TEMPERATURE PERFORMANCE ESPECIALLY IN THE ADHESIVE AREA. THEY ARE PREPARED BY REACING POLY (OXYCAPROYL) DIOL, P,P''-DIPHENYLMETHANE DIISOCYANATE, AND A DEFINED MIXTURE OF ALPHA, OMEGA-ALKANEDIOLS.
Inventors
- 👤 R Ward
- 👤 F Critchfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664; Y; Y10; Y10S; Y10S528/00; Y10S528/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |