Patent US2470828A successfully refreshed from Google Patents.
US2470828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube testing apparatus
Assignee: Sunoco Inc
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Filing: 1946-01-10
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Granted: 1949-05-24
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Expires: 1966-01-10
Abstract
No abstract record available.
Inventors
- 👤 John W Millington
- 👤 William H Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:03
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9013; G01N27/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1324818A
Cited
US1665397A
Cited
GB368006A
Cited
US1983388A
Cited
US2049306A
Cited
US2194229A
Cited
US2250703A
Cited
US2359894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |