US2802818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalides
Assignee: Dow Chemical Co
•
Filing: 1956-07-05
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Granted: 1957-08-13
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Expires: 1976-07-05
Abstract
No abstract record available.
Inventors
- 👤 Donald D Wheeler
- 👤 David C Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:11
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A PHTHALIDE HAVING THE FORMULA WHEREIN EACH R REPRESENTS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, METHYL, ETHYL, CHLORO AND NITRO, AND N IS AN INTEGER OF FROM 1 TO 2, INCLUSIVE.
Claim 2
Dependent Claim
33 words
A PHTHALIDE HAVING THE FORMULA WHEREIN EACH R REPRESENTS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, METHYL, ETHYL, CHLORO AND NITRO, AND N IS AN INTEGER OF FROM 1 TO 2, INCLUSIVE.
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) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |