US3062837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing
Assignee: —
•
Filing: —
•
Granted: 1962-11-06
•
Expires: 1979-11-06
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:04
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/88; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
THE METHOD WHICH COMPRISES CONTACTING WITH A CATALYTIC AMOUNT OF AN APROTONIC LEWIS ACID A TETRAALKYL-1,3CYCLOBUTANEDIONE OF THE FORMULA,
Claim 2
Independent Claim
19 words
THE METHOD WHICH COMPRISES CONTACTING WITH A CATALYTIC AMOUNT OF AN APROTONIC LEWIS ACID A TETRAALKYL-1,3CYCLOBUTANEDIONE OF THE FORMULA,
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) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |