Patent US2457695A successfully refreshed from Google Patents.
US2457695A
Expired / Lapsed
US
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Ultra high frequency apparatus for inspection of sheet and other materials
Assignee: GTE Sylvania Inc
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Filing: 1945-09-24
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Granted: 1948-12-28
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Expires: 1965-09-24
Abstract
No abstract record available.
Inventors
- 👤 Charles L Liskow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:24
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/12; G01N; G01N22/00; Y; Y10; Y10S; Y10S131/00; Y10S131/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1827349A
Cited
AT116609B
Cited
US2301251A
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US2399325A
Cited
US2395560A
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US2396044A
Cited
US2403289A
Cited
US2420342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |