Patent US2197179A successfully refreshed from Google Patents.
US2197179A
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Two-speed supercharger
Assignee: RTX Corp
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Filing: 1939-02-03
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Granted: 1940-04-16
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Expires: 1959-02-03
Abstract
No abstract record available.
Inventors
- 👤 Donald S Hersey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:39
CPC Classifications
F; F02; F02B; F02B39/00; F02B39/02; F02B39/04; F02B39/06; F02B37/00; F02B37/04; F02B37/10; F02B37/105; F16; F16H; F16H48/00; F16H48/12; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S74/00; Y10S74/05; Y10T; Y10T74/00; Y10T74/19; Y10T74/19005; Y10T74/19023; Y10T74/19037; Y10T74/19219; Y10T74/19284
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) | 1943-04-16 | 1943-10-16 | 1944-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-16 | 1947-10-16 | 1948-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-16 | 1951-10-16 | 1952-04-16 | $7700.00 | Window Closed / Lapsed |