Patent US2428791A successfully refreshed from Google Patents.
US2428791A
Expired / Lapsed
US
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Engine
Assignee: Individual
•
Filing: 1945-09-21
•
Granted: 1947-10-14
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Expires: 1965-09-21
Abstract
No abstract record available.
Inventors
- 👤 Alvin R Earnshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:16
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/26; F02; F02B; F02B2275/00; F02B2275/20; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F2001/244; F02F2001/245; F02F2001/246
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1306198A
Cited
US1423365A
Cited
US876880A
Cited
US1289498A
Cited
US1366448A
Cited
US1445319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |