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US2522307A
Expired / Lapsed
US
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Hardness testing machine
Assignee: Individual
•
Filing: 1948-11-09
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Granted: 1950-09-12
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Expires: 1968-11-09
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Shaff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:55
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US280668A
Cited
US1121050A
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US1830842A
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US2003863A
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US2037527A
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US2109521A
Cited
US2427151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |