US2904557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-phthalidyl carbamic acid esters
Assignee: Dow Chemical Co
•
Filing: 1958-08-06
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Granted: 1959-09-15
•
Expires: 1978-08-06
Abstract
No abstract record available.
Inventors
- 👤 Donald D Wheeler
- 👤 David C Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:48
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
AN N-PHTHALIDYL CARBAMIC ACID ESTER HAVING THE STRUCTURE
Claim 2
Dependent Claim
8 words
AN N-PHTHALIDYL CARBAMIC ACID ESTER HAVING THE STRUCTURE
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |