US1995402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aryl-ketones and phenol esters
Assignee: RHEINISCHE KAMPFER FABRIK
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Filing: 1932-03-07
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Granted: 1935-03-26
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Expires: 1952-03-07
Abstract
No abstract record available.
Inventors
- 👤 Skraup Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:41
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/06; C09B11/08; C07; C07C; C07C45/00; C07C45/45; C07C45/46; C07C45/51; C07C45/54; C07C49/00; C07C49/76; C07C49/782; C07C49/788; C07C49/82; C07C49/83; C07C49/84; C07C59/00; C07C59/40; C07C59/42; C07C59/52; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/06; C07D311/20
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) | 1938-03-25 | 1938-09-24 | 1939-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-25 | 1942-09-24 | 1943-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-25 | 1946-09-24 | 1947-03-26 | $7700.00 | Window Closed / Lapsed |