US2191405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of aqueous solutions of phenol, its homologues and derivatives
Assignee: "unichem" Chemikalien Handels A-G
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Filing: 1936-05-21
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Granted: 1940-02-20
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Expires: 1956-05-21
Abstract
No abstract record available.
Inventors
- 👤 Hueter Richard
- 👤 Neu Richard
- 👤 Engelbrecht Heinz-Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:43
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/30; C; C07; C07C; C07C37/00; C07C37/68; C07C37/88
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) | 1943-02-19 | 1943-08-21 | 1944-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-19 | 1947-08-21 | 1948-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-19 | 1951-08-21 | 1952-02-20 | $7700.00 | Window Closed / Lapsed |