Patent FR878999A successfully refreshed from Google Patents.
US2405133A
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Method and means for measuring surface roughness
Assignee: Brush Development Co
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Filing: 1942-10-07
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Granted: 1946-08-06
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Expires: 1962-10-07
Abstract
No abstract record available.
Inventors
- 👤 Walter J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:36
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/34
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) | 1949-08-05 | 1950-02-04 | 1950-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-08-05 | 1954-02-04 | 1954-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-08-05 | 1958-02-04 | 1958-08-06 | $7700.00 | Window Closed / Lapsed |