US2756239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrolysis of organic compounds
Assignee: EIDP Inc
•
Filing: 1953-09-24
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Granted: 1956-07-24
•
Expires: 1973-09-24
Abstract
No abstract record available.
Inventors
- 👤 Anderson John Lynde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:37
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C08; C08G; C08G61/00; C08G61/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
PROCESS OF PREPARING A QUINODIMETHANE-TYPE COMPOUND WHICH COMPRISES PYROLYZING AN ETHYL METHYLSUBSTITUTED ORGANIC RING COMPOUND OF AROMATIC NATURE HAVING NOT MORE THAN TWO RINGS AND HAVING THE ETHYL GROUP AND THE METHYL GROUP AS THE ONLY SUBSTITUENTS AND ATTACHED TO ANNULAR CARBONS OF THE SAME RING WHICH ARE SEPARATED FROM EACH OTHER BY TWO OTHER ANNULAR CARBONS.
Claim 2
Dependent Claim
57 words
PROCESS OF PREPARING A QUINODIMETHANE-TYPE COMPOUND WHICH COMPRISES PYROLYZING AN ETHYL METHYLSUBSTITUTED ORGANIC RING COMPOUND OF AROMATIC NATURE HAVING NOT MORE THAN TWO RINGS AND HAVING THE ETHYL GROUP AND THE METHYL GROUP AS THE ONLY SUBSTITUENTS AND ATTACHED TO ANNULAR CARBONS OF THE SAME RING WHICH ARE SEPARATED FROM EACH OTHER BY TWO OTHER ANNULAR CARBONS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |