US4941136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable hour meter for recording elapsed operation time
Assignee: Stewart Warner Corp
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Filing: 1988-09-13
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Granted: 1990-07-10
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Expires: 2008-09-13
Abstract
Abstract A completely electronic programmable hour meter is disclosed. The hour meter accumulates and displays run time of the device being measured. The hour meter can also count pulses. The meter can be preprogrammed with a maintenance timer limit which is compared to the accumulated run time. If the accumulated run time equals or exceeds the preprogrammed time limit an alarm display flashes. The hour meter will store the accumulated run time for up to 5 years if power is interrupted. This memory retention occurs without use of a battery. The elapsed time is stored in a plurality of registers such that no register is written to more than a preselected number of times, nominally ten thousand, until all the registers have been updated the preselected number of times.
Inventors
- 👤 II Edward J. Breitung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:48
CPC Classifications
G; G04; G04F; G04F10/00; G04F10/04; G07; G07C; G07C3/00; G07C3/02; G07C3/04; G07C5/00; G07C5/02; G07C5/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
130 words
A programmable elapsed time meter comprising: an electronic circuit including means for calculating elapsed time, E 2 PROM memory means having a plurality of registers for storing the calculated elapsed time, and means for continually updating the the stored calculated elapsed time in said plurality of registers such that no register is updated more than a preselected number of times until all the registers have been updated said preselected number of times; input terminals for enabling said electronic circuit; a liquid crystal display connected to said electronic circuit, capable of displaying the elapsed time stored in said electronic circuit; and a capacitor connected to said electronic circuit for supplying power to said electronic circuit to enable the electronic circuit to update the E 2 PROM memory means at power shutdown.
Claim 2
Dependent Claim
130 words
A programmable elapsed time meter comprising: an electronic circuit including means for calculating elapsed time, E 2 PROM memory means having a plurality of registers for storing the calculated elapsed time, and means for continually updating the the stored calculated elapsed time in said plurality of registers such that no register is updated more than a preselected number of times until all the registers have been updated said preselected number of times; input terminals for enabling said electronic circuit; a liquid crystal display connected to said electronic circuit, capable of displaying the elapsed time stored in said electronic circuit; and a capacitor connected to said electronic circuit for supplying power to said electronic circuit to enable the electronic circuit to update the E 2 PROM memory means at power shutdown.
Claim 3
Dependent Claim
19 words
The programmable elapsed time according to claim 1 wherein said electronic circuit is configured to measure and record pulses.
Claim 4
Dependent Claim
21 words
The programmable elapsed time meter according to claim 1 wherein said liquid crystal display displays five digits and a maintenance pixel.
Claim 5
Dependent Claim
56 words
The programmable elapsed time meter according to claim 3 wherein said electronic circuit can store a maintenance time limit and said electronic circuit compares the maintenance time limit with the elapsed time and flashes a warning pixel on said liquid crystal display if the recorded time is greater than or equal to the maintenance time limit.
Claim 6
Dependent Claim
27 words
The programmable elapsed time meter according to claim 4 wherein said electronic circuit can be configured to display 1 digit to the right of the decimal point.
Claim 7
Dependent Claim
67 words
The programmable elapsed time meter according to claim 3 further comprising a view switch input connected to said electronic circuit wherein said liquid crystal display will display the accumulated time for up to 5 seconds after said view switch input is engaged and the accumulated maintenance time will be reset to zero when said view switch input is engaged for 5 seconds upon powering up said circuit.
Claim 8
Dependent Claim
26 words
The programmable elapsed time meter according to claim 1 further comprising a housing wherein said liquid crystal display is visible through a face in said housing.
Claim 9
Dependent Claim
67 words
The programmable elapsed time meter according to claim 1 further comprising external connections from said electronic circuit to an alarm wherein said electronic circuit can store a maintenance time limit and said electronic circuit compares the maintenance time limit with elapsed time and if the elapsed time is greater than or equal to the maintenance time limit said electronic circuit activates the alarm through said external connection.
Claim 10
Dependent Claim
16 words
The programmable elapsed time meter according to claim 8 wherein said alarm is an audible buzzer.
Claim 11
Dependent Claim
16 words
The programmable elapsed time meter according to claim 8 wherein said alarm is a warning light.
Claim 12
Dependent Claim
26 words
The programmable elapsed time meter according to claim 1, wherein said means for writing the elapsed time into said plurality of registers is a programmable microcontroller.
Claim 13
Dependent Claim
20 words
The programmable elapsed time meter as set forth in claim 1, wherein said preselected number of times is ten-thousand times.
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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) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |