Patent US1101821A successfully refreshed from Google Patents.
US2372662A
Expired / Lapsed
US
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Portable hardness testing instrument
Assignee: Schneider Electric Buildings Americas Inc
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Filing: 1942-04-02
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Granted: 1945-04-03
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Expires: 1962-04-02
Abstract
No abstract record available.
Inventors
- 👤 Ritchie P Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:32
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-04-02 | 1948-10-02 | 1949-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-04-02 | 1952-10-02 | 1953-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-04-02 | 1956-10-02 | 1957-04-03 | $7700.00 | Window Closed / Lapsed |