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US3435091A
Expired / Lapsed
US
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Preparation of 1,2,4-trimethyl-5-isopropylbenzene
Assignee: Gelsenberg Benzin AG
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Filing: 1967-05-22
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Granted: 1969-03-25
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Expires: 1987-05-22
Abstract
No abstract record available.
Inventors
- 👤 Paul Hofmann
- 👤 Karl Peterlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:50
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/68; C07C2/70; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1213; C07C2527/125; C07C2527/126; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2754341A
Cited
US3132189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |