Patent US2750406A successfully refreshed from Google Patents.
US2750406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1, 2, 3, 4, 4a, 9, 10, 10a-octahydro-7-hydroxy-1, 4a-dimethyl-9-oxo-1-phenanthrenecarboxylic acid and esters thereof
Assignee: Hercules Powder Co
•
Filing: 1953-03-24
•
Granted: 1956-06-12
•
Expires: 1973-03-24
Abstract
No abstract record available.
Inventors
- 👤 Paul F Ritchie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:13
CPC Classifications
C; C07; C07C; C07C62/00; C07C62/30; C07C62/38; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
AS A NEW COMPOSITION OF MATTER, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 1,2,3,4,4A,9,10,10AOCTAHYDRO - 7 - HYDROXY - 1,4A - DIMETHYL - 9 - OXO - 1 PHENANTHRENECARBOXYLIC ACID AND 1 -CARBOALKOXY - 1,2,3 4,4A,9,10,10A - OCTAHYDRO - 7 - HYDROXY - 1,4A - DIMETHYL 9 - OXOPHENANTHRENES.
Claim 2
Dependent Claim
50 words
AS A NEW COMPOSITION OF MATTER, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 1,2,3,4,4A,9,10,10AOCTAHYDRO - 7 - HYDROXY - 1,4A - DIMETHYL - 9 - OXO - 1 PHENANTHRENECARBOXYLIC ACID AND 1 -CARBOALKOXY - 1,2,3 4,4A,9,10,10A - OCTAHYDRO - 7 - HYDROXY - 1,4A - DIMETHYL 9 - OXOPHENANTHRENES.
Claim 3
Dependent Claim
60 words
THE PROCESS OF PREPARING ALKYL ESTERS OF 1,2,3,4,4A, 9,10,10A - OCTAHYDRO - 7 - HYDROXY - 1,4A - DIMETHYL - 9 OXO - 1 - PHENANTHRENECARBOXYLIC ACID WHICH COMPRISES CONTACTING AN ALKYL ESTER OF 14 - HYDROPEROXY - 9 - OXODE HYDROABIETIC ACID WITH A STRONGLY ACID CATALYST AT A TEMPERATURE OF FROM ABOUT 0 C. TO ABOUT 100* C.
Claim 4
Dependent Claim
60 words
THE PROCESS OF PREPARING ALKYL ESTERS OF 1,2,3,4,4A, 9,10,10A - OCTAHYDRO - 7 - HYDROXY - 1,4A - DIMETHYL - 9 OXO - 1 - PHENANTHRENECARBOXYLIC ACID WHICH COMPRISES CONTACTING AN ALKYL ESTER OF 14 - HYDROPEROXY - 9 - OXODE HYDROABIETIC ACID WITH A STRONGLY ACID CATALYST AT A TEMPERATURE OF FROM ABOUT 0 C. TO ABOUT 100* C.
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 |