Energy efficient asymmetric pre-swirl vane and twisted propeller propulsion system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Jun 12, 1990
Grant Date -
N/A
app pub date -
Mar 3, 1988
filing date -
Mar 3, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An asymmetric set of pre-swirl vanes (stators) and a specially matched propeller for use on an inclined shaft. The propulsor is designed by considering the mutual interaction of the propeller on the vanes and the vanes on the propeller. The propulsor unit provides the following: 1. increased propulsive efficiency due to the reduced rotational (swirl) and axial kinetic energy losses in the propulsor's slipstream; 2. reduction or elimination of propeller cavitation; 3. reduction or elimination of unsteady propulsor forces as well as propulsor-induced hull vibrations. A unique feature of the present invention is that a prior art flat faced commercially available propeller can be modified to match the vane flow field for optimum propulsor performance. The use of commercially available propellers reduces the installation or hardware cost significantly and allows the propeller to be repaired easily if damaged. Another unique feature is that the vanes operate well with an unmodified commercially available prior art flat faced, optimum constant pitch propeller, and that the propeller as modified for use with the vanes also performs exceptionally well without the vanes. The modified propeller without vanes in fact outperformed the prior art flat faced optimum constant pitch propeller used on the 41 foot test craft.
First Claim
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Family
- No Family data available.
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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UNITED STATES OF AMERICA THE AS REPRESENTED BY THE SECRETARY OF THE DEPARTMENT OF TRANSPORTATION | Not Provided |
International Classification(s)

- 1988 Application Filing Year
- B63H Class
- 223 Applications Filed
- 0 Patents Issued To-Date
- 0 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Larimer, Gary E | Sterling, VA | 2 | 10 |
# of filed Patents : 2 Total Citations : 10 | |||
VanLiew, Donald H | Severna Park, MD | 2 | 10 |
# of filed Patents : 2 Total Citations : 10 |
Cited Art Landscape
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Patent Citation Ranking
- 3 Citation Count
- B63H Class
- 0 % this patent is cited more than
- 35 Age
Forward Cite Landscape
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
Full Text

Legal Events
Date | Code | Event | Description |
---|---|---|---|
Jan 30, 2018 | STCH | INFORMATION ON STATUS: PATENT DISCONTINUATION | free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
Jun 17, 1998 | FP | LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE | Effective Date: Jun 17, 1998 |
Jun 14, 1998 | LAPS | LAPSE FOR FAILURE TO PAY MAINTENANCE FEES | |
Feb 14, 1998 | REMI | MAINTENANCE FEE REMINDER MAILED | |
Oct 12, 1993 | FPAY | FEE PAYMENT | year of fee payment: 4 |
Oct 31, 1992 | FEPP | FEE PAYMENT PROCEDURE | free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
Jun 12, 1990 | I | Issuance | |
Mar 03, 1988 | F | Filing | |
Mar 03, 1988 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:LARIMER, GARY E.;VAN LIEW, DONALD H.;REEL/FRAME:004859/0860 Owner name: UNITED STATES OF AMERICA, THE, AS REPRESENTED BY T Effective Date: Mar 03, 1988 |

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