US2672049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring roughness of surfaces
Assignee: Individual
•
Filing: 1949-06-14
•
Granted: 1954-03-16
•
Expires: 1969-06-14
Abstract
No abstract record available.
Inventors
- 👤 Hallendorff Carl Johan Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:03
CPC Classifications
G; G01; G01B; G01B5/00; G01B5/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2253992A
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US899224A
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US1041145A
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US2045176A
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US2177051A
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GB559622A
Cited
US2460726A
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US2417148A
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US2474015A
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US2437679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |