Patent US3131199A successfully refreshed from Google Patents.
US3131199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2, 3-dihydro-2-benzofuranamines
Assignee: Smith Kline & French Laboratories Ltd
•
Filing: 1962-08-10
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Granted: 1964-04-28
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Expires: 1982-08-10
Abstract
No abstract record available.
Inventors
- 👤 Roe Anthony Maitland
- 👤 Willey George Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:38
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/78; C07D307/82; C07D307/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A CHEMICAL COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
6 words
A CHEMICAL COMPOUND OF THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |