US3597371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foams based on alkylene oxide adducts of alkylene-bis-phenylene diamines
Assignee: Bayer Corp
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Filing: 1969-06-05
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Granted: 1971-08-03
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Expires: 1989-06-05
Abstract
Abstract POLYURETHANE FOAMS MADE BY REACTING AN ORGANIC POLYISOCYANATE IN THE PRESENCE OF A BLOWING AGENT WITH AN ALKYLENE ODIDE ADDUCT OF ALKYLENE-BIS-PHENYLENE DIAMINES.
Inventors
- 👤 J W Britain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/329; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5033; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |