Patent US2426879A successfully refreshed from Google Patents.
US2426879A
Expired / Lapsed
US
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Radial aircraft engine
Assignee: RTX Corp
•
Filing: 1944-09-01
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Granted: 1947-09-02
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Expires: 1964-09-01
Abstract
No abstract record available.
Inventors
- 👤 Leonard S Hobbs
- 👤 Andrew V D Willgoos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:23
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/222; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2173; Y10T74/2183; Y10T74/2184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR342309A
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US1237311A
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US1293712A
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GB120285A
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US1355451A
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US1367194A
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GB232399A
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US1860814A
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GB306942A
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US1904680A
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US2154359A
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GB497592A
Cited
US2350377A
Cited
US2366852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-01 | 1951-03-03 | 1951-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-01 | 1955-03-03 | 1955-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-01 | 1959-03-03 | 1959-09-02 | $7700.00 | Window Closed / Lapsed |