Patent US3487228A successfully refreshed from Google Patents.
US3487228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power generating system
Assignee: Individual
•
Filing: 1967-04-17
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Granted: 1969-12-30
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Bernard Kriegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:03
CPC Classifications
F; F03; F03B; F03B13/00; F03B13/12; F03B13/14; F03B13/16; F03B13/18; F03B13/1845; F03B13/187; Y; Y02; Y02E; Y02E10/00; Y02E10/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US657355A
Cited
US793497A
Cited
US988508A
Cited
US2179537A
Cited
FR872125A
Cited
GB801984A
Cited
US2871790A
Cited
US3289592A
Cited
US3307827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |