Patent US2154922A successfully refreshed from Google Patents.
US2154922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making them
Assignee: —
•
Filing: —
•
Granted: 1939-04-18
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Expires: 1956-04-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:27
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/70; C07D239/72; C07D239/86; C07D239/88; C07D233/00; C07D233/04; C07D233/06; C07D233/08; C07D233/12; C07D233/14
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) | 1942-04-17 | 1942-10-17 | 1943-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-17 | 1946-10-17 | 1947-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-17 | 1950-10-17 | 1951-04-18 | $7700.00 | Window Closed / Lapsed |