US3489391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic ring gate force balancing
Assignee: Library and Archives Canada
•
Filing: 1967-02-02
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Granted: 1970-01-13
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Expires: 1987-02-02
Abstract
No abstract record available.
Inventors
- 👤 Feodor Kanger
- 👤 Jacques Arthur Desbaillets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:25
CPC Classifications
F; F03; F03B; F03B11/00; F03B11/004; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/46; F04D29/466; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB305214A
Cited
US1821054A
Cited
US2055134A
Cited
FR1108435A
Cited
US2846185A
Cited
GB783798A
Cited
US2986367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |