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Patent US3140316A successfully refreshed from Google Patents.
US3140316A
Expired / Lapsed
US
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Manufacture of diaminodiphenylether
Assignee: Harshaw Chemical Co
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Filing: 1960-06-23
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Granted: 1964-07-07
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Expires: 1980-06-23
Abstract
No abstract record available.
Inventors
- 👤 Jack L Towle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:44
CPC Classifications
C; C07; C07C; C07C213/00; C07C213/02; C07C209/00; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1703915A
Cited
US1574337A
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US1877302A
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US2400287A
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US2454468A
Cited
DE912931C
Cited
US2765341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |