Patent US3476806A successfully refreshed from Google Patents.
US3476806A
Expired / Lapsed
US
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Continuous methylenedianiline process
Assignee: EIDP Inc
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Filing: 1967-04-24
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Granted: 1969-11-04
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Expires: 1987-04-24
Abstract
No abstract record available.
Inventors
- 👤 Herbert Otto Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3163666A
Cited
US2683730A
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US2818433A
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US3274247A
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US3253031A
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US3277173A
Cited
US3297759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |