Patent US3704500A successfully refreshed from Google Patents.
US3704500A
Expired / Lapsed
US
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Method of correcting a number of revolution of a screw propeller
Assignee: Kawasaki Heavy Industries Ltd
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Filing: 1970-10-15
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Granted: 1972-12-05
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Expires: 1990-10-15
Abstract
Abstract A method of adjusting the number of revolutions of a screw propeller having the steps of cutting the trailing edge of each blade of the propeller from and along the trailing edge, and working and shaping the face of the blade to a curvature to provide a proper setback.
Inventors
- 👤 Hiroshi Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:35
CPC Classifications
B; B63; B63H; B63H1/00; B63H1/02; B63H1/12; B63H1/14; B63H1/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49332; Y10T29/49718; Y10T29/49748
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A method of adjusting the number of revolutions of a used, fixed pitch screw propeller of an ocean going marine vessel without removing the same from said vessel, said method comprising the steps of: smoothly reducing the trailing edge only of each blade of the propeller, a predetermined amount, the maximum extent of reduction of said trailing edge at any one point along said edge being, in terms of blade width, between 0.7 to 0.9 percent, and working and shaping the face of the blade along said trailing edge to a predetermined curvature providing a setback from the trailing edge of which the maximum extent of the same at any one point along said trailing edge, in terms of blade length, is between 0.6 to 0.7 percent.
Claim 2
Independent Claim
127 words
A method of adjusting the number of revolutions of a used, fixed pitch screw propeller of an ocean going marine vessel without removing the same from said vessel, said method comprising the steps of: smoothly reducing the trailing edge only of each blade of the propeller, a predetermined amount, the maximum extent of reduction of said trailing edge at any one point along said edge being, in terms of blade width, between 0.7 to 0.9 percent, and working and shaping the face of the blade along said trailing edge to a predetermined curvature providing a setback from the trailing edge of which the maximum extent of the same at any one point along said trailing edge, in terms of blade length, is between 0.6 to 0.7 percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |