Patent US2632011A successfully refreshed from Google Patents.
US2632011A
Expired / Lapsed
US
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Tetrahydrophthalic acid compounds
Assignee: Shell Development Co
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Filing: 1948-03-20
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Granted: 1953-03-17
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Expires: 1968-03-20
Abstract
No abstract record available.
Inventors
- 👤 Harry De V Finch
- 👤 Seaver A Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:10
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/08; C07C69/00; C07C69/017; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/89
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
A COMPOUND OF THE GROUP CONSISTING OF (1) ANHYDRIDES OF THE FORMULA
References Cited (Backward Citations)
DE739438C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |