US2980848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weld seam testing apparatus
Assignee: Shell USA Inc
•
Filing: 1956-12-24
•
Granted: 1961-04-18
•
Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Paul L Datt
- 👤 William J Warren
- 👤 Richard B Willoughby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:52
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2133687A
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US2102452A
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US2228294A
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US2415789A
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US2437455A
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US2489920A
Cited
US2587686A
Cited
US2580670A
Cited
US2806992A
Cited
US2842851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |