Patent US2057820A successfully refreshed from Google Patents.
US2680834A
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US
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Testing apparatus
Assignee: Individual
•
Filing: 1950-08-21
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Granted: 1954-06-08
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Expires: 1970-08-21
Abstract
No abstract record available.
Inventors
- 👤 Grover P Burns
- 👤 Hubert C Shull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/07; Y; Y10; Y10S; Y10S439/00; Y10S439/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1610563A
Cited
US1996063A
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US2163475A
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US2461111A
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US2476943A
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US2582629A
Cited
US2587771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |