US3180613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable francis turbine seals
Assignee: Library and Archives Canada
•
Filing: 1962-11-14
•
Granted: 1965-04-27
•
Expires: 1982-11-14
Abstract
No abstract record available.
Inventors
- 👤 Robert S Sproule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:01
CPC Classifications
F; F03; F03B; F03B11/00; F03B11/006; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US971850A
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US1114238A
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US1238731A
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US1820150A
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US1525884A
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US1783427A
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US2475316A
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US2919103A
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US2818227A
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FR1134269A
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US2921533A
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US2869471A
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US3066612A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |