Patent US3919631A successfully refreshed from Google Patents.
US3919631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leadless probe
Assignee: Individual
•
Filing: 1973-07-05
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Granted: 1975-11-11
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Expires: 1993-07-05
Abstract
Abstract A self-contained continuity checker is hand-held and includes batteries for placing the conductive exterior of a probe at a voltage capable of actuating an amplifier within the probe via the probe''s input terminal. A circuit is completed through the hand and body of the user and the component being tested. The triggering of the amplifier energizes a light-emitting diode mounted near the probe tip, or a device integral with the probe for supplying an audible output.
Inventors
- 👤 Richard D Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:11
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/06788; G01R19/00; G01R19/145; G01R19/155
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
185 words
A probe for indicating electrical continuity comprising: a hand-held body, said body comprising an outer tubular electrically conductive portion for making electrical connection with the hand of a user; an electrical connecting member supported by said body and electrically insulated from said outer tubular electrically conductive portion, said electrical connecting member including a threadably received removable tip connection; a high input impedance amplifier housed in said body, said amplifier comprising a Darlington transistor amplifier having an input directly coupled to the electrical connecting member; an output means integral with said body and responsive to said amplifier for producing an output; and a power supply housed in said body and directly electrically connected to said outer tubular electrically conductive portion, said power supply acting alone to energize said output means through an electrically continuous path, said path including, in electrical series, said power supply means, said outer tubular electrically conductive portion, the hands and body of the user, a device under test, said electrical connecting member, said high impedance amplifier, and said output means, whereby the electrical continuity of said device under test may be indicated.
Claim 2
Dependent Claim
185 words
A probe for indicating electrical continuity comprising: a hand-held body, said body comprising an outer tubular electrically conductive portion for making electrical connection with the hand of a user; an electrical connecting member supported by said body and electrically insulated from said outer tubular electrically conductive portion, said electrical connecting member including a threadably received removable tip connection; a high input impedance amplifier housed in said body, said amplifier comprising a Darlington transistor amplifier having an input directly coupled to the electrical connecting member; an output means integral with said body and responsive to said amplifier for producing an output; and a power supply housed in said body and directly electrically connected to said outer tubular electrically conductive portion, said power supply acting alone to energize said output means through an electrically continuous path, said path including, in electrical series, said power supply means, said outer tubular electrically conductive portion, the hands and body of the user, a device under test, said electrical connecting member, said high impedance amplifier, and said output means, whereby the electrical continuity of said device under test may be indicated.
Claim 3
Dependent Claim
58 words
The device of claim 1 further including an adaptor for providing an input to said probe, said adaptor including a contact for making a connection with said electrical connecting member, and a clip member for making contact with the outer tubular electrically conductive portion of said probe, whereby an input to said probe is provided from said adaptor.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |