Patent US4438397A successfully refreshed from Google Patents.
US4438397A
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Test pin
Assignee: Teradyne Inc
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Filing: 1982-06-14
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Granted: 1984-03-20
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Expires: 2002-06-14
Abstract
Abstract Test pins with sidewardly biased plungers to insure electrical contact.
Inventors
- 👤 Jonathon H. Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:27
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/06711; G01R1/06716; G01R1/06722
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
A test pin comprising: a tubular shaped housing, a plunger with a contacting end and a body portion that is slidably mounted within said housing along the longitudinal axis of said housing, said plunger including, at its other end, a stud having a width in a direction transverse to said axis that is smaller than that of said body portion, and a spring carried in said housing for yieldingly biasing said plunger along said axis relative to said housing, said spring including a winding that grips said stud, said winding being characterized in that it has an axis that is at an angle to the longitudinal axis of said spring when said spring is unstressed so that said spring forces said plunger to one side against an inner surface of said housing, whereby electrical contact between said plunger and said housing is improved.
Claim 2
Dependent Claim
143 words
A test pin comprising: a tubular shaped housing, a plunger with a contacting end and a body portion that is slidably mounted within said housing along the longitudinal axis of said housing, said plunger including, at its other end, a stud having a width in a direction transverse to said axis that is smaller than that of said body portion, and a spring carried in said housing for yieldingly biasing said plunger along said axis relative to said housing, said spring including a winding that grips said stud, said winding being characterized in that it has an axis that is at an angle to the longitudinal axis of said spring when said spring is unstressed so that said spring forces said plunger to one side against an inner surface of said housing, whereby electrical contact between said plunger and said housing is improved.
Claim 3
Dependent Claim
18 words
The test pin of claim 1 wherein said spring has a plurality of windings that grip said stud.
References Cited (Backward Citations)
US3435168A
Cited
US4105970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |