US3701631A
Expired / Lapsed
US
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Nondestructive spot test method for titanium and titanium alloys
Assignee: National Aeronautics and Space Administration
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Filing: 1971-04-21
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Granted: 1972-10-31
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Expires: 1991-04-21
Abstract
Abstract A METHOD FOR SPOT TEST IDENTIFACATION OF TITANIUM AND VARIOUS TITANIUM ALLOYS COMMONLY USED IN AEROSPACE APPLICATIONS. THE SPOT TEST IDENTIFICATION INVOLVES COLOR CODES OBTAINED WHEN A DROP OF CONCENTRATED HYDROFLUORIC ACID AND A DROP OF CONCENTRATED NITRIC ACID ARE PLACED ON THE SURFACE TO BE TESTED.
Inventors
- 👤 Maywood L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:31
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/20; G01N33/202; G01N33/2028
Claims Analysis
Total Claims: 0
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |