US2142170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclopentane-polyhydrophenanthrene derivatives
Assignee: Winthrop Chemical Co Inc
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Filing: 1938-02-12
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Granted: 1939-01-03
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Expires: 1958-02-12
Abstract
No abstract record available.
Inventors
- 👤 Bockmuhl Max
- 👤 Ehrhart Gustav
- 👤 Ruschig Heinrich
- 👤 Aumuller Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:19
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
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) | 1942-01-02 | 1942-07-04 | 1943-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-02 | 1946-07-04 | 1947-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-02 | 1950-07-04 | 1951-01-03 | $7700.00 | Window Closed / Lapsed |