Patent US3676006A successfully refreshed from Google Patents.
US3676006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of measuring the roughness of a surface
Assignee: US Philips Corp
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Filing: 1969-09-22
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Granted: 1972-07-11
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Expires: 1989-09-22
Abstract
Abstract THE INVENTION RELATES O A METHOD OF MEASURING THE ROUGHNESS OF A SURFACE. THE INVENTION ALSO RELATES TO AN APPARATUS FOR CARRYING OUT THE METHOD.
Inventors
- 👤 Christiaan Hendrik Fran Velzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:50
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/02097; G01B11/00; G01B11/30
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |