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US2977478A
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US
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Method of and apparatus for measuring the thickness of materials
Assignee: EXATEST GES fur MESSTECHNIK MI
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Filing: 1954-11-10
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Granted: 1961-03-28
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Expires: 1974-11-10
Abstract
No abstract record available.
Inventors
- 👤 Wuppermann August Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:34
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22531E
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US2222429A
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US2264725A
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US2323128A
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US2395482A
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US2547545A
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US2675482A
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US2903590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |