Patent US5367684A successfully refreshed from Google Patents.
Patent US1985277A successfully refreshed from Google Patents.
US1985277A
Expired / Lapsed
US
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Flaw detector for tubular conductors
Assignee: Sperry Products Inc
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Filing: 1933-10-28
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Granted: 1934-12-25
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Expires: 1953-10-28
Abstract
No abstract record available.
Inventors
- 👤 Fred D Braddon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:15
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9006
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) | 1937-12-24 | 1938-06-25 | 1938-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-12-24 | 1942-06-25 | 1942-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-12-24 | 1946-06-25 | 1946-12-25 | $7700.00 | Window Closed / Lapsed |