Patent US2764580A successfully refreshed from Google Patents.
US2764580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of
Assignee: —
•
Filing: —
•
Granted: 1956-09-25
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Expires: 1973-09-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:15
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/14; C07D223/18; C07D223/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2554736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |