US3431276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing imide derivatives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1966-05-16
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Granted: 1969-03-04
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Expires: 1986-05-16
Abstract
No abstract record available.
Inventors
- 👤 Eric Nield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:14
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/44; C07D207/444; C07D207/448; B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; C07D207/452; C08; C08F; C08F2/00; C08F2/38
Claims Analysis
Total Claims: 0
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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) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |