Patent US3313818A successfully refreshed from Google Patents.
US3313818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
7, 10-dihydro-3, 10-dioxo-7-(lower-alkyl)-3h-pyrano[3, 2-f]quinoline-3-carboxylic acid derivatives
Assignee: STWB Inc
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Filing: 1965-04-14
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Granted: 1967-04-11
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Expires: 1985-04-14
Abstract
No abstract record available.
Inventors
- 👤 George Y Lesher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:31
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; C07D491/044; C07D491/052
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
A 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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |