US2830756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
K cooper
Assignee: —
•
Filing: —
•
Granted: 1958-04-15
•
Expires: 1975-04-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:04
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/30; F01C1/32; F01C21/00; F01C21/08; F01C21/0809; F01C21/0818; F01C21/0854; F01C21/0863; F04; F04C; F04C18/00; F04C18/30; F04C18/34; F04C18/356; F04C18/3562; F04C18/3564; F04C23/00; F04C23/008; F04C28/00; F04C28/06; F04C28/24; F04C28/26; F04C28/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2732126A
Cited
US711092A
Cited
US1424977A
Cited
US1427053A
Cited
US1575860A
Cited
US1616992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |