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US2838522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalides
Assignee: Dow Chemical Co
•
Filing: 1956-04-30
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Granted: 1958-06-10
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Expires: 1976-04-30
Abstract
No abstract record available.
Inventors
- 👤 Donald D Wheeler
- 👤 David C Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:26
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/88; C07D307/89
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A 3-THIOPHTHALIDE HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A 3-THIOPHTHALIDE HAVING 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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |