US3076813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
alpha, beta, gamma, sigma-tetra-arylporphins
Assignee: Monsanto Chemicals Ltd
•
Filing: 1960-08-11
•
Granted: 1963-02-05
•
Expires: 1980-08-11
Abstract
No abstract record available.
Inventors
- 👤 Dexter B Sharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:33
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
IN THE PREPARATION OF PORPHINS BY THE REACTION OF PYRROLE AND AN ALDEHYDE, THE IMPROVEMENT WHICH COMPRISES HEATING THE REACTANTS IN THE ABSENCE OF SOLVENT TO 150* TO 250*C.
Claim 2
Dependent Claim
29 words
IN THE PREPARATION OF PORPHINS BY THE REACTION OF PYRROLE AND AN ALDEHYDE, THE IMPROVEMENT WHICH COMPRISES HEATING THE REACTANTS IN THE ABSENCE OF SOLVENT TO 150* TO 250*C.
References Cited (Backward Citations)
US2647908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-04 | 1966-08-06 | 1967-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-04 | 1970-08-06 | 1971-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-04 | 1974-08-06 | 1975-02-05 | $7700.00 | Window Closed / Lapsed |