Patent US4722222A successfully refreshed from Google Patents.
US4722222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ski speedometer
Assignee: Insight Inc
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Filing: 1986-09-25
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Granted: 1988-02-02
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Expires: 2006-09-25
Abstract
Abstract A transducer is mounted on a ski and transmits ultrasonic waves toward the stationary medium over which the ski is moving. The same transducer or a separate transducer detects waves reflected from the stationary medium. A computer calculates the speed of the ski from the Doppler shift of the reflected waves and actuates a readout unit to indicate the speed to the skier.
Inventors
- 👤 Peter K. Purdy
- 👤 Kirk W. Beach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:32
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/017; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/60; G01S15/00; G01S15/02; G01S15/50; G01S15/58; G01S15/60; G02B27/0101; G02B27/0172; A; A63; A63C; A63C2203/00; A63C2203/18; G02B2027/0118; G02B2027/0123; G02B2027/014; G02B2027/0143; G02B27/0179; G02B2027/0187
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A speedometer for a ski supported over and moving along a stationary medium comprising transducer means mounted for movement with the ski for transmitting waves toward the stationary medium and for detecting such waves reflected from the stationary medium, means for measuring the difference in frequency between the transmitted and reflected waves in accordance with the Doppler effect, and means for calculating and indicating the speed of the ski from such frequency difference.
Claim 2
Dependent Claim
73 words
A speedometer for a ski supported over and moving along a stationary medium comprising transducer means mounted for movement with the ski for transmitting waves toward the stationary medium and for detecting such waves reflected from the stationary medium, means for measuring the difference in frequency between the transmitted and reflected waves in accordance with the Doppler effect, and means for calculating and indicating the speed of the ski from such frequency difference.
Claim 3
Dependent Claim
68 words
A speedometer for a ski supported on a stationary medium comprising a first transducer mounted stationarily on the ski for transmitting waves downward to the medium, a second transducer mounted stationarily on the ski for detecting transmitted waves reflected from the supporting medium, means for calculating the speed of the ski relative to the supporting medium in accordance with the Doppler effect, and means for indicating such speed.
Claim 4
Dependent Claim
68 words
A speedometer for a ski supported on a stationary medium comprising a first transducer mounted stationarily on the ski for transmitting waves downward to the medium, a second transducer mounted stationarily on the ski for detecting transmitted waves reflected from the supporting medium, means for calculating the speed of the ski relative to the supporting medium in accordance with the Doppler effect, and means for indicating such speed.
Claim 5
Dependent Claim
22 words
The speedometer defined in claim 2, in which the first transducer directs waves downward and forward at an acute angle to vertical.
Claim 6
Dependent Claim
17 words
The speedometer defined in claim 3, in which the second transducer is offset from the first transducer.
Claim 7
Dependent Claim
36 words
The speedometer defined in claim 4, in which the second transducer has a receiving face angled relative to the ski at an angle sharper than the angle of transmission of the waves by the first transducer.
Claim 8
Dependent Claim
27 words
The speedometer defined in claim 2, in which the transducers are mounted over the top surface of the ski for transmission of ultrasonic waves through the ski.
Claim 9
Dependent Claim
27 words
The speedometer defined in claim 2, in which the second transducer has a flat receiving face positioned perpendicular to waves reflected at the bottom of the ski.
Claim 10
Dependent Claim
63 words
A speedometer for a ski supported by a stationary medium, said ski having a cavity therein, comprising transducer means mounted in said cavity for transmitting waves generally downward and for detecting transmitted waves reflected from the supporting medium, means for calculating the speed of the ski relative to the supporting medium in accordance with the Doppler effect, and means for indicating such speed.
Claim 11
Dependent Claim
63 words
A speedometer for a ski supported by a stationary medium, said ski having a cavity therein, comprising transducer means mounted in said cavity for transmitting waves generally downward and for detecting transmitted waves reflected from the supporting medium, means for calculating the speed of the ski relative to the supporting medium in accordance with the Doppler effect, and means for indicating such speed.
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) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |