Patent US4078417A successfully refreshed from Google Patents.
US4078417A
Expired / Lapsed
US
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Test panel for evaluating inspection penetrants
Assignee: United States Department of the Air Force
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Filing: 1977-03-24
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Granted: 1978-03-14
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Expires: 1997-03-24
Abstract
Abstract A test panel for use in evaluating fluorescent penetrants and being composed of a spring steel substrate having surfaces coated with a thin electroless nickel plating capable of producing stress induced microcracks in the plated surfaces.
Inventors
- 👤 Toy T. Shigekawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:51
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/91; G01N19/00; G01N19/08; G01N21/93
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
46 words
A test panel for use in evaluating the performance capabilities of fluorescent penetrants comprising a spring steel substrate coated with a brittle electroless nickel plating of approximately 0.0005 to 0.0010 inches in depth with stress induced microcracks being present in the plated surfaces of said panel.
Claim 2
Dependent Claim
46 words
A test panel for use in evaluating the performance capabilities of fluorescent penetrants comprising a spring steel substrate coated with a brittle electroless nickel plating of approximately 0.0005 to 0.0010 inches in depth with stress induced microcracks being present in the plated surfaces of said panel.
Claim 3
Dependent Claim
25 words
A test panel in accordance with claim 1 in which said surface is coated with a fluorscent penetrating agent that permeates the stress induced microcracks.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |