US3735251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scratch proof probe for manual testing of electrically insulating coatings
Assignee: Pfaudler Inc
•
Filing: 1971-09-23
•
Granted: 1973-05-22
•
Expires: 1991-09-23
Abstract
Abstract A scratch proof probe for electrical testing of coatings such as plastic, glass or the like is provided by sandwiching a number of spring wire reinforcing members between two strips of conductive rubber.
Inventors
- 👤 O Britton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:09
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/145
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
A scratch proof probe for manual testing of electrically insulating coatings comprising: a. A conductive head adapted to be connected to a handle and to be connected to a voltage source through said handle; b. a plurality of elongated conductive spring wire reinforcing members extending from said head; and c. a pair of narrow strips of conductive rubber for contacting said insulating coating, said strips being secured to and enveloping said spring wire reinforcing members, with a first one of said spring wire reinforcing members extending for substantially the full length of said conductive rubber strips and at least one of said spring wire reinforcing members being shorter and thicker than said first spring wire reinforcing member.
Claim 2
Dependent Claim
117 words
A scratch proof probe for manual testing of electrically insulating coatings comprising: a. A conductive head adapted to be connected to a handle and to be connected to a voltage source through said handle; b. a plurality of elongated conductive spring wire reinforcing members extending from said head; and c. a pair of narrow strips of conductive rubber for contacting said insulating coating, said strips being secured to and enveloping said spring wire reinforcing members, with a first one of said spring wire reinforcing members extending for substantially the full length of said conductive rubber strips and at least one of said spring wire reinforcing members being shorter and thicker than said first spring wire reinforcing member.
Claim 3
Dependent Claim
27 words
A probe according to claim 1 wherein the pair of conductive rubber strips are bonded together and the spring wire reinforcing members are interposed between said strips.
References Cited (Backward Citations)
US279557A
Cited
US3046476A
Cited
US2978637A
Cited
US3069620A
Cited
US3153561A
Cited
US3379963A
Cited
US3417327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |