US3426358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of phenols
Assignee: Hooker Chemical Corp
•
Filing: 1965-11-19
•
Granted: 1969-02-04
•
Expires: 1985-11-19
Abstract
No abstract record available.
Inventors
- 👤 Hans L Schlichting
- 👤 Anthony D Barbopoulos
- 👤 Walter H Prahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:23
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/16; C07C37/14; C07C37/18; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2430190A
Cited
US2448942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |