Patent US3811091A successfully refreshed from Google Patents.
US3811091A
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Electronic tachometer
Assignee: Itel Corp
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Filing: 1972-08-24
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Granted: 1974-05-14
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Expires: 1992-08-24
Abstract
Abstract This invention relates to a tachometer for detecting the velocity of movement of a moveable member by use of signals indicating passage of that member past predetermined points along the path of movement.
Inventors
- 👤 I Ha
- 👤 J Touchton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:21
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A velocity signal generating system for generating a signal responsive to the velocity of movement of a moveable member along a predetermined path, said system comprising; means to generate a plurality of intermittent position signals responsive to movement of the member past predetermined positions spaced along the path; means to differentiate said intermittent position signals to generate a plurality of intermittent velocity signals, and means to transmit said velocity signals to an output circuit during alternate time periods thereby to supply a substantially constant velocity signal to the output signal.
Claim 2
Dependent Claim
90 words
A velocity signal generating system for generating a signal responsive to the velocity of movement of a moveable member along a predetermined path, said system comprising; means to generate a plurality of intermittent position signals responsive to movement of the member past predetermined positions spaced along the path; means to differentiate said intermittent position signals to generate a plurality of intermittent velocity signals, and means to transmit said velocity signals to an output circuit during alternate time periods thereby to supply a substantially constant velocity signal to the output signal.
Claim 3
Dependent Claim
36 words
A velocity signal generating system as defined in claim 1 wherein said position signal generating means are spaced in a manner to generate a plurality of position signals which are phase different relative to each other.
Claim 4
Dependent Claim
30 words
A velocity signal generating system as defined in claim 2 including means to invert selected ones of the position signals to generate a greater number of phase different position signals.
Claim 5
Dependent Claim
39 words
A velocity signal generating system as defined in claim 1 wherein said means to transmit said velocity signals to the output circuit includes means to detect and transmit each velocity signal during the time period a predetermined condition exists.
Claim 6
Dependent Claim
34 words
A velocity signal generating system as defined in claim 4 wherein said means to detect is a signal level detector for detecting and transmitting each velocity signal as it occurs between predetermined signal levels.
Claim 7
Dependent Claim
28 words
A velocity signal generating system as defined in claim 5 including means to change the predetermined signal levels in response to a predetermined condition of the moveable member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |