US3665309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time interval measuring instrument
Assignee: Tokyo Keiki Inc
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Filing: 1970-05-06
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Granted: 1972-05-23
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Expires: 1990-05-06
Abstract
Abstract An instrument for measuring the time interval between first and second signals of the same period having a gate circuit for permitting the passage therethrough of a counting pulse controlled by a first pulse synchronized with the first signal in phase, a first counter for pulse derived from the gate circuit, a second counter capable of reversible counting another pulse, a detector circuit detecting agreement of the outputs of the first and second counter, means controlling the gate circuit to inhibit the passage therethrough of the pulse of the first counter based upon the output of the detector circuit, means producing a second pulse based upon the output of the detector circuit, and means stopping the operation of the second counter when the second pulse is in phase with the second signal, whereby the time interval between the first and second pulses is obtained when the second counter is in its inoperative condition.
Inventors
- 👤 Shosuke Sato
- 👤 Shigeru Saito
- 👤 Saburo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:36
CPC Classifications
G; G04; G04F; G04F10/00; G04F10/04; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/24; G01S1/245
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
220 words
In a craft navigation system including: an instrument for measuring the time interval between first and second signals having the same period and comprising a counting pulse source; a gate circuit means connected to said counting pulse source; a gate signal generator connected to said gate circuit to open it each time said first signal occurs; a first counter means connected to said gate circuit means; a second counting pulse source; a second counter means connected to said second counting pulse source and capable of reversible counting and settable to an arbitrary value; a detector circuit means connected to the outputs of said first and second counter means, the output of said detector circuit connected to said gate signal generator to inhibit the passage through said gate circuit of counting pulse to said first counter means; means for producing a second pulse from the output of said detector circuit means; stop means receiving said second pulse from said detector circuit for stopping said second counter means when the second pulse is in phase with said second signal; and indicator means directly receiving the output of said second counter means to indicate the content of said second counter means whereby the time interval between the first and second pulses is indicated when the second counter means is in its inoperative condition.
Claim 2
Dependent Claim
220 words
In a craft navigation system including: an instrument for measuring the time interval between first and second signals having the same period and comprising a counting pulse source; a gate circuit means connected to said counting pulse source; a gate signal generator connected to said gate circuit to open it each time said first signal occurs; a first counter means connected to said gate circuit means; a second counting pulse source; a second counter means connected to said second counting pulse source and capable of reversible counting and settable to an arbitrary value; a detector circuit means connected to the outputs of said first and second counter means, the output of said detector circuit connected to said gate signal generator to inhibit the passage through said gate circuit of counting pulse to said first counter means; means for producing a second pulse from the output of said detector circuit means; stop means receiving said second pulse from said detector circuit for stopping said second counter means when the second pulse is in phase with said second signal; and indicator means directly receiving the output of said second counter means to indicate the content of said second counter means whereby the time interval between the first and second pulses is indicated when the second counter means is in its inoperative condition.
Claim 3
Dependent Claim
55 words
A time interval measuring instrument as claimed in claim 1 wherein said stop means includes a phase comparator circuit means for comparing in phase said second pulse with said second signal and connecting to control the counting operation of said second counter means as a function of the output of said phase comparator circuit means.
Claim 4
Dependent Claim
50 words
A time interval measuring circuit as claimed in claim 2 which includes an automatic command signal generator circuit means receiving the output of said phase comparator circuit means and connected to control the second counter means as a function of the output of said automatic command signal generator circuit means.
Claim 5
Dependent Claim
28 words
A time interval measuring instrument as claimed in claim 1 including a manual control means for controlling the counting operation of said second counter means by manual operation.
Claim 6
Dependent Claim
85 words
A time interval measuring instrument as claimed in claim 1 which includes a manual control means for controlling the counting operation of said second counter means by manual operation, a phase comparator circuit means for comparing the phase of said second pulse with said second signal, automatic control means for automatically controlling the counting operation of said second counter means with the output of said phase comparator circuit means, and switch means for connecting said manual and automatic control means to said second counter means.
Claim 7
Dependent Claim
24 words
A time interval measuring instrument as claimed in claim 1 wherein said first and second counting pulse sources are obtained from a single generator.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |