US3420800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric materials produced by interacting polyisocyanate and water in the presence of polyaldimine or polyketimine
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1964-01-29
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Granted: 1969-01-07
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Expires: 1984-01-29
Abstract
No abstract record available.
Inventors
- 👤 Geoffrey Arthur Haggis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/302; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3256; C08G18/3271; C08G18/3296; C08G2110/00; C08G2110/0008; C08G2110/0025; C08G2110/0083; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 0
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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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |