Patent US3840808A successfully refreshed from Google Patents.
US3840808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clamp-on electrical meter
Assignee: TIF INSTRUMENTS INC US
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Filing: 1973-04-30
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Granted: 1974-10-08
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Expires: 1993-04-30
Abstract
Abstract An improved electrical measuring device including a clamp-on ammeter is disclosed wherein a probe for obtaining readings of resistance and/or voltage is rigidly affixed to one of the clampon jaws of the ammeter and internally electrically connected through the jaw to circuits provided in the body of the device. This probe, attached to a clamp on jaw, in conjunction with an additional probe on a flexible cable render the device capable of providing convenient and accurate readings of resistance or voltage under a wide variety of operating conditions.
Inventors
- 👤 L Liebermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:50
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/145; G01R1/00; G01R1/20; G01R1/22; G01R15/00; G01R15/14; G01R15/18; G01R15/186; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
An improved multi-function electrical meter including a body containing a socket for attaching an electrical probe on a flexible cable and circuits for measuring current and at least one other electrical parameter; a clamp-on probe including two jaw members mechanically and electrically connected to the body of the meter for measuring current said jaw members being configured so that at least one of them forms a mounting surface substantially transverse to the instrument access at its furthest extremity from the instrument said jaw member containing in its interior a threaded socket adjacent said mounting surface; a conductor extending from the socket through the jaw member into the body for connection with the circuits therein; an insulating coating on the surfaces of the socket and conductor for preventing electrical contact between either of them and the jaw member; and a conductive probe member provided with a threaded portion engageable in the threaded socket for measuring various electrical parameters in conjunction with the probe on the flexible cable, without the necessity of using more than two hands in order to make such measurement.
Claim 2
Dependent Claim
181 words
An improved multi-function electrical meter including a body containing a socket for attaching an electrical probe on a flexible cable and circuits for measuring current and at least one other electrical parameter; a clamp-on probe including two jaw members mechanically and electrically connected to the body of the meter for measuring current said jaw members being configured so that at least one of them forms a mounting surface substantially transverse to the instrument access at its furthest extremity from the instrument said jaw member containing in its interior a threaded socket adjacent said mounting surface; a conductor extending from the socket through the jaw member into the body for connection with the circuits therein; an insulating coating on the surfaces of the socket and conductor for preventing electrical contact between either of them and the jaw member; and a conductive probe member provided with a threaded portion engageable in the threaded socket for measuring various electrical parameters in conjunction with the probe on the flexible cable, without the necessity of using more than two hands in order to make such measurement.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |