Patent US3157710A successfully refreshed from Google Patents.
US3157710A
Expired / Lapsed
US
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Process for the preparation of 1, 1, 4, 4-tetraalkyl-1, 3-butadiene
Assignee: Eastman Kodak Co
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Filing: 1962-04-16
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Granted: 1964-11-17
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Expires: 1982-04-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Vinton A Hoyle
- 👤 Herman E Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:25
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C1/207; C07C1/213; C07C2531/00; C07C2531/02; C07C2531/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
THE METHOD WHICH COMPRISES CONTACTING AN ACID CATALYST AT A TEMPERATURE IN THE RANGE OF ABOUT 125*C. TO ABOUT 250*C., WITH A CARBOXYLIC ACID ESTER HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF:
Claim 2
Independent Claim
34 words
THE METHOD WHICH COMPRISES CONTACTING AN ACID CATALYST AT A TEMPERATURE IN THE RANGE OF ABOUT 125*C. TO ABOUT 250*C., WITH A CARBOXYLIC ACID ESTER HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF:
References Cited (Backward Citations)
US2375086A
Cited
US2502430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |