US3044744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drag reducing method and arrangement for hydraulic turbine runners
Assignee: Library and Archives Canada
•
Filing: 1959-08-17
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Granted: 1962-07-17
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Expires: 1979-08-17
Abstract
No abstract record available.
Inventors
- 👤 Berlyn Martin John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
F; F03; F03B; F03B15/00; F03B15/02; F03B15/04; F03B15/06; F03B15/18; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y10; Y10S; Y10S277/00; Y10S277/913
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1606887A
Cited
CA574981A
Cited
US1823702A
Cited
US1860618A
Cited
US1898023A
Cited
GB668434A
Cited
US2685429A
Cited
AT182085B
Cited
DE929360C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-16 | 1966-01-15 | 1966-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-16 | 1970-01-15 | 1970-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-16 | 1974-01-15 | 1974-07-17 | $7700.00 | Window Closed / Lapsed |