US2183574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of unsaturated cyclic
Assignee: —
•
Filing: —
•
Granted: 1939-12-19
•
Expires: 1956-12-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:53
CPC Classifications
C; C07; C07C; C07C13/00; C07C13/02; C07C13/16; C07C13/20; C07C1/00; C07C1/26; C07C1/30; C07C2601/00; C07C2601/12; C07C2601/16; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/935
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) | 1942-12-18 | 1943-06-19 | 1943-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-12-18 | 1947-06-19 | 1947-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-12-18 | 1951-06-19 | 1951-12-19 | $7700.00 | Window Closed / Lapsed |