Patent US1874443A successfully refreshed from Google Patents.
Patent US2222118A successfully refreshed from Google Patents.
US2222118A
Expired / Lapsed
US
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Propeller
Assignee: Knapp Monarch Co
•
Filing: 1937-03-09
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Granted: 1940-11-19
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Expires: 1957-03-09
Abstract
No abstract record available.
Inventors
- 👤 Newnham Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:29
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/382; B; B63; B63H; B63H1/00; B63H1/02; B63H1/12; B63H1/14; B63H1/20
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) | 1943-11-19 | 1944-05-20 | 1944-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-19 | 1948-05-20 | 1948-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-19 | 1952-05-20 | 1952-11-19 | $7700.00 | Window Closed / Lapsed |