US2846447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Side chain removal process
Assignee: Monsanto Chemicals Ltd
•
Filing: 1954-09-03
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Granted: 1958-08-05
•
Expires: 1974-09-03
Abstract
No abstract record available.
Inventors
- 👤 William E Weesner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:37
CPC Classifications
C; C07; C07D; C07D317/00; C07D317/08; C07D317/44; C07D317/70; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
IN A PROCESS FOR THE REMOVAL OF THE B-CARBOXYETHYL SIDE CHAIN OF A POLYHYDROPHENANTHRENE COMPOUND, THE STEP WHICH COMPRISES SUBJECTING AN ALKALI METAL SALT OF AN 1,8A-DIMETHYL-1-(B-CARBOXYETHYL) - $10-POLYHYDROPHENANTHREN-2-ONE OF THE STRUCTURE
Claim 2
Dependent Claim
32 words
IN A PROCESS FOR THE REMOVAL OF THE B-CARBOXYETHYL SIDE CHAIN OF A POLYHYDROPHENANTHRENE COMPOUND, THE STEP WHICH COMPRISES SUBJECTING AN ALKALI METAL SALT OF AN 1,8A-DIMETHYL-1-(B-CARBOXYETHYL) - $10-POLYHYDROPHENANTHREN-2-ONE OF THE STRUCTURE
References Cited (Backward Citations)
US2749367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |