Patent US3450991A successfully refreshed from Google Patents.
US3450991A
Expired / Lapsed
US
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Digital direct reading high frequency measuring apparatus and method
Assignee: W K ROSENBERRY
•
Filing: 1967-06-05
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Granted: 1969-06-17
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Expires: 1987-06-05
Abstract
No abstract record available.
Inventors
- 👤 Zoltan Tarczy-Hornoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:43
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R23/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2235755A
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GB749060A
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US2851596A
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US2951986A
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US3071725A
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US3039685A
Cited
US3229203A
Cited
US3150350A
Cited
US3213361A
Cited
US3242461A
Cited
US3293559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |