US2750407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted phenanthrenecarboxylic acid and esters thereof
Assignee: Hercules Powder Co
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Filing: 1953-07-31
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Granted: 1956-06-12
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Expires: 1973-07-31
Abstract
No abstract record available.
Inventors
- 👤 Paul F Ritchie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:42
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/09; C07C62/00; C07C62/30; C07C62/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A DEHYDROABIETIC ACID DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF 14-HYDROXY-9-OXODEHYDROABIETIC ACID AND 14-ACYLOXY-9-OXODEHYDROABIETIC ACID, AND THE LOWER ALKYL ESTERS THEREOF.
Claim 2
Dependent Claim
21 words
A DEHYDROABIETIC ACID DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF 14-HYDROXY-9-OXODEHYDROABIETIC ACID AND 14-ACYLOXY-9-OXODEHYDROABIETIC ACID, AND THE LOWER ALKYL ESTERS THEREOF.
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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |