Patent US2702807A successfully refreshed from Google Patents.
US2702807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New class of halo-phthalides and methods of preparing the same
Assignee: Wyeth Holdings LLC
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Filing: 1952-05-03
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Granted: 1955-02-22
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Expires: 1972-05-03
Abstract
No abstract record available.
Inventors
- 👤 Brian L Hutchings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:01
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/88
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
THE METHOD OF PREPARING COMPOUNDS REPRESENTED BY THE FORMULA:
Claim 2
Independent Claim
9 words
THE METHOD OF PREPARING COMPOUNDS REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-21 | 1958-08-23 | 1959-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-21 | 1962-08-23 | 1963-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-21 | 1966-08-23 | 1967-02-22 | $7700.00 | Window Closed / Lapsed |