US2018213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-alkyl- and 4-aralkyl-dihydro-resorcinols and process for the manufacture of same
Assignee: F Hoffmann La Roche AG
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Filing: 1934-12-21
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Granted: 1935-10-22
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Expires: 1954-12-21
Abstract
No abstract record available.
Inventors
- 👤 Klingenfuss Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:24
CPC Classifications
C; C07; C07C; C07C35/00; C07C35/02; C07C35/08; C07C35/14; C07C45/00; C07C45/006
Claims Analysis
Total Claims: 0
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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) | 1938-10-21 | 1939-04-22 | 1939-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-10-21 | 1943-04-22 | 1943-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-10-21 | 1947-04-22 | 1947-10-22 | $7700.00 | Window Closed / Lapsed |