Patent US3330838A successfully refreshed from Google Patents.
US3330838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chroman derivatives
Assignee: Pfizer Inc
•
Filing: 1964-08-17
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Granted: 1967-07-11
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Expires: 1984-08-17
Abstract
No abstract record available.
Inventors
- 👤 Augstein Joachim
- 👤 Alastair M Monro
- 👤 Thomas I Wrigley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:08
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF ORGANIC BASES OF THE FORMULA:
Claim 2
Dependent Claim
13 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF ORGANIC BASES OF THE FORMULA:
References Cited (Backward Citations)
US3271448A
Cited
US3247221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |