Patent US3606579A successfully refreshed from Google Patents.
US3606579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller
Assignee: Individual
•
Filing: 1969-01-22
•
Granted: 1971-09-20
•
Expires: 1989-01-22
Abstract
Abstract A PROPELLER OF THE MARINE SCREW TYPE HAVING A MAIN BLADE AND AN AUXILIARY BLADE LOCATED AT THE DISCHARGE END OF THE MAIN BLADE, SAID BLADES HAVING A SLOT RUNNING THEREBETWEEN AT THE TRAILING EDGE OF THE MAIN PROPELLER BLADE. THE WIDTH OF THE SLOT IN CROSS SECTIONAL AREA REDUCES ITS SIZE FROM THE PRESSURE SIDE OF THE BLADE TOWARDS THE SUCTION SIDE OF THE BLADE TO CREATE A THROTTLE EFFECT RESULTING IN AN INCREASE IN WATER FLOW VELOCITY THROUGH THE SLOT AND A REDUCTION OF THE PRESSURE IN THE SUCTION SIDE OF THE PROPELLER. THE STRUCTURE SO PRESENTED REDUCES CAVITATION AND IMPROVES PERFORMANCE OF THE PROPELLER BY REDUCING TURBULENCE ON THE SUCTION SIDE OF THE PROPELLER BLADE.
Inventors
- 👤 Henry Mehus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:41
CPC Classifications
B; B63; B63H; B63H1/00; B63H1/02; B63H1/12; B63H1/14; B63H1/28; B63H1/18; B63H2001/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |