Patent US3211731A successfully refreshed from Google Patents.
Patent US2331073A successfully refreshed from Google Patents.
US2331073A
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Propulsion apparatus
Assignee: Individual
•
Filing: 1942-07-10
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Granted: 1943-10-05
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Expires: 1962-07-10
Abstract
No abstract record available.
Inventors
- 👤 Albert H Harvey
- 👤 Frank J Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:30
CPC Classifications
B; B63; B63H; B63H5/00; B63H5/07; B63H5/08; F; F16; F16H; F16H1/00; F16H1/02; F16H1/20; F16H1/22; B63H23/00; B63H23/02; B63H23/06; B63H2023/062; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19074; Y10T74/19107
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) | 1946-10-04 | 1947-04-05 | 1947-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-10-04 | 1951-04-05 | 1951-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-10-04 | 1955-04-05 | 1955-10-05 | $7700.00 | Window Closed / Lapsed |