Patent US5877618A successfully refreshed from Google Patents.
US5877618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand held non-contact voltage tester
Assignee: Power Products LLC
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Filing: 1997-07-31
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Granted: 1999-03-02
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Expires: 2017-07-31
Abstract
Abstract A non-contact voltage tester has a self-test feature so that when a switch clip of the tester is actuated, light and sound indicator devices are energized to give a single blink and beep, respectively, following which the tester is ready for probing for a voltage. The light and sound indicator devices also indicate the presence of a voltage when the switch is actuated and a voltage is detected at the probe tip of the tester.
Inventors
- 👤 Thomas M. Luebke
- 👤 David L. Wiesemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:47
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/07; G01R1/06788
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
In a non-contact voltage tester of the type having a single probe tip for sensing the presence of a voltage, an indicating lamp for signalling a user of the tester when said voltage is present, circuitry for detecting a voltage at said probe tip and operating said indicating lamp in response to said detected voltage, a battery power supply for energizing said circuitry and a switch actuated by the user of said tester for operatively connecting said power supply with said circuitry, the improvement wherein said indicating lamp emits a signal of limited duration to the operator when said switch is first actuated by the user in the absence of a voltage detected by said circuitry at said probe tip and said lamp is positioned inside a translucent section of a housing of said tester, said lamp and translucent section being positioned between said switch and said probe tip.
Claim 2
Dependent Claim
149 words
In a non-contact voltage tester of the type having a single probe tip for sensing the presence of a voltage, an indicating lamp for signalling a user of the tester when said voltage is present, circuitry for detecting a voltage at said probe tip and operating said indicating lamp in response to said detected voltage, a battery power supply for energizing said circuitry and a switch actuated by the user of said tester for operatively connecting said power supply with said circuitry, the improvement wherein said indicating lamp emits a signal of limited duration to the operator when said switch is first actuated by the user in the absence of a voltage detected by said circuitry at said probe tip and said lamp is positioned inside a translucent section of a housing of said tester, said lamp and translucent section being positioned between said switch and said probe tip.
Claim 3
Dependent Claim
22 words
The improvement as defined in claim 1, wherein said tester includes a sound source which is activated when said lamp is activated.
Claim 4
Dependent Claim
30 words
The improvement as defined in claim 1, wherein light emitted by said lamp and transmitted by said translucent section is visible for 360° around a longitudinal axis of said tester.
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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) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |