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Patent US2935573A successfully refreshed from Google Patents.
US2935573A
Expired / Lapsed
US
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Recorder having visual indicator for high-frequency generator operation
Assignee: US Philips Corp
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Filing: 1954-12-29
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Granted: 1960-05-03
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Expires: 1974-12-29
Abstract
No abstract record available.
Inventors
- 👤 Haarler Hendrikus Gerhardus
- 👤 Wittenberg Nico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:20
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B27/00; G11B27/10; G11B27/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA481549A
Cited
US1677021A
Cited
US1951036A
Cited
US2149080A
Cited
US2542021A
Cited
US2658953A
Cited
US2703877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |