Patent US2536632A successfully refreshed from Google Patents.
US2536632A
Expired / Lapsed
US
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Apparatus for testing the hardness of materials
Assignee: Individual
•
Filing: 1947-06-18
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Granted: 1951-01-02
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Expires: 1967-06-18
Abstract
No abstract record available.
Inventors
- 👤 Ernst Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:56
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1569097A
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US1125236A
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US1320748A
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US1381288A
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US1752964A
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US1661718A
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US2122203A
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US2372451A
Cited
CH239978A
Cited
CH248851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |