US3911746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time and condition data logger
Assignee: United States Department of the Navy
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Filing: 1973-04-27
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Granted: 1975-10-14
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Expires: 1993-04-27
Abstract
Abstract A condition vs. time data logger for recording on a digital elapsed-time meter and a strip chart recorder, the time and duration of a predetermined condition on an object or in an environment to be monitored. Temperature is detected by a thermistor in a bridge circuit, the signal is then amplified, and applied to a plurality of comparators which compare the signal representative of temperature to reference voltages individually preset at each comparator. If the predetermined condition is met, and the signal matches the reference voltage, a comparator actuates a relay which energizes an elapsed time digital meter and displaces the pen on a strip chart recorder, thus logging the time and the duration of a condition desired to be recorded.
Inventors
- 👤 Ayers M Spangler
- 👤 Luigi A Vagnoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:28
CPC Classifications
G; G07; G07C; G07C3/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
204 words
An apparatus for linearly producing a record of time versus a series of events profile comprising: event detector means positionable in an environment to be monitored for producing a first output signal indicative of said event; a Wheatstone bridge circuit connected to said event detector means, said event detector means forming an arm thereof; amplifier means connected to said Wheatstone bridge for producing a second output signal in response to said first output signal; a plurality adjustable voltage source means for producing a plurality of variable reference voltages; a plurality of comparator means for comparing said second output signal produced by said amplifier means and said plurality of variable reference voltages to produce one or more third output signals whenever said second output signal exceeds any of said plurality of reference voltages; a plurality of switching means connected to and activated by said third output signals; and multichannel event recording means connected to and activated by said switching means for recording an elapsed time of said series of events indicated by said plurality of switching means in a series of linear steps irrespective of the nonlinearity of said event detector means to produce a linear measurement of time versus said series of events profile.
Claim 2
Independent Claim
204 words
An apparatus for linearly producing a record of time versus a series of events profile comprising: event detector means positionable in an environment to be monitored for producing a first output signal indicative of said event; a Wheatstone bridge circuit connected to said event detector means, said event detector means forming an arm thereof; amplifier means connected to said Wheatstone bridge for producing a second output signal in response to said first output signal; a plurality adjustable voltage source means for producing a plurality of variable reference voltages; a plurality of comparator means for comparing said second output signal produced by said amplifier means and said plurality of variable reference voltages to produce one or more third output signals whenever said second output signal exceeds any of said plurality of reference voltages; a plurality of switching means connected to and activated by said third output signals; and multichannel event recording means connected to and activated by said switching means for recording an elapsed time of said series of events indicated by said plurality of switching means in a series of linear steps irrespective of the nonlinearity of said event detector means to produce a linear measurement of time versus said series of events profile.
Claim 3
Dependent Claim
16 words
The event measuring apparatus of claim 1 wherein said recording means include an elapsed time meter.
Claim 4
Dependent Claim
15 words
The event measuring apparatus of claim 1 wherein said recording means includes a strip-chart recorder.
Claim 5
Dependent Claim
21 words
The event measuring apparatus of claim 1 wherein said recording means comprises both an elapsed-time meter and a strip chart recorder.
Claim 6
Dependent Claim
15 words
The event measuring apparatus of claim 1 wherein said switching means is an electro-magnetic relay.
Claim 7
Dependent Claim
12 words
The event measuring apparatus of claim 1 wherein said event is temperature.
Claim 8
Dependent Claim
15 words
The event measuring apparatus of claim 6 wherein said event detector means is a thermistor.
Claim 9
Dependent Claim
20 words
The event measuring apparatus of claim 1 including an elapsed time meter connected to and actuated by said switching means.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |