Patent US5475863A successfully refreshed from Google Patents.
US3492818A
Expired / Lapsed
US
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Rotary stirling engine-with sliding displacer rotor
Assignee: Individual
•
Filing: 1968-07-01
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Granted: 1970-02-03
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Expires: 1988-07-01
Abstract
No abstract record available.
Inventors
- 👤 Donald A Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:07
CPC Classifications
F; F02; F02B; F02B53/00; F02G; F02G1/00; F02G1/04; F02G1/043; F02G2270/00; F02G2270/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |