Patent US4514724A successfully refreshed from Google Patents.
US4514724A
Expired / Lapsed
US
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Electrical warning system for malfunctions in refrigeration
Assignee: Individual
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Filing: 1982-09-28
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Granted: 1985-04-30
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Expires: 2002-09-28
Abstract
Abstract An electrical warning system for malfunctions in refrigeration equipment driven by an electric motor comprises a main resistor connected in series with the motor to cause only a small voltage drop in the power supply to the motor, a high amp shunt across the main resistor comprising a diode, resistor and light-emitting diode, and a low amp shunt across the main resistor comprising a diode and light-emitting diode with the latter having in parallel a capacitor as well as a resistor in series with a zener diode.
Inventors
- 👤 Walter J. Valentine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:53
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/165; G01R19/16566; G01R19/16571; F; F25; F25D; F25D29/00; F25D29/008; G01R19/145; G08; G08B; G08B5/00; G08B5/22; G08B5/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
An electrical warning system for malfunctions in refrigeration equipment driven by an alternating current motor, which comprises a main resistor connected in series with said motor and selected to cause a voltage drop in the power supplied to said motor not exceeding 5 volts, a high amp shunt connected in parallel to said main resistor comprising a first diode, a first resistor and a first light-emitting diode, all connected in series, and a low amp shunt connected in parallel to said main resistor comprising a second diode and a second light-emitting diode connected in series, with a capacitor connected in parallel to said second light-emitting diode, and with a second resistor and zener diode connected in series to each other and together connected in parallel to said second light-emitting diode.
Claim 2
Dependent Claim
130 words
An electrical warning system for malfunctions in refrigeration equipment driven by an alternating current motor, which comprises a main resistor connected in series with said motor and selected to cause a voltage drop in the power supplied to said motor not exceeding 5 volts, a high amp shunt connected in parallel to said main resistor comprising a first diode, a first resistor and a first light-emitting diode, all connected in series, and a low amp shunt connected in parallel to said main resistor comprising a second diode and a second light-emitting diode connected in series, with a capacitor connected in parallel to said second light-emitting diode, and with a second resistor and zener diode connected in series to each other and together connected in parallel to said second light-emitting diode.
Claim 3
Dependent Claim
15 words
The electrical warning system of claim 1 wherein the first resistor is a variable resistor.
Claim 4
Dependent Claim
30 words
The electrical warning system of claim 1 wherein the high amp shunt has an additional variable resistor connected in series with the first resistor which has a predetermined fixed resistance.
Claim 5
Dependent Claim
15 words
The electrical warning system of claim 1 wherein the main resistor is a variable resistor.
Claim 6
Dependent Claim
16 words
The electrical warning system of claim 1 wherein the main resistor is formed of nichrome ribbon.
Claim 7
Dependent Claim
25 words
The electrical warning system of claim 1 wherein the first light-emitting diode has a red case and the second light-emitting diode has a green case.
Claim 8
Dependent Claim
35 words
The electrical warning system of claim 1, 2, 3, 4, 5 or 6 wherein the main resistor is selected to cause a voltage drop of about 2 volts in the power supplied to the motor.
Claim 9
Dependent Claim
50 words
The electrical warning system of claim 2, 3, 4 or 5 wherein the first light-emitting diode has a red case, the second light-emitting diode has a green case, and the main resistor is selected to cause a voltage drop of about 2 volts in the power supplied to the motor.
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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) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |