US3538340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for generating power
Assignee: WILLIAM J LANG
•
Filing: 1968-03-20
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Granted: 1970-11-03
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Expires: 1988-03-20
Abstract
No abstract record available.
Inventors
- 👤 William J Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:21
CPC Classifications
F; F02; F02C; F02C3/00; F02C3/14; F02C3/16; E; E21; E21B; E21B43/00; E21B43/28; F02C6/00; F02C6/14; F02C6/16; F05; F05B; F05B2260/00; F05B2260/42; F05B2260/422; Y; Y02; Y02E; Y02E60/00; Y02E60/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1247520A
Cited
US2433896A
Cited
US2454058A
Cited
US3151250A
Cited
US3277654A
Cited
US3438203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |