Patent US2603720A successfully refreshed from Google Patents.
US2603720A
Expired / Lapsed
US
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High-level recording system
Assignee: Individual
•
Filing: 1948-02-26
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Granted: 1952-07-15
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Expires: 1968-02-26
Abstract
No abstract record available.
Inventors
- 👤 Emory G Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/34; G11B3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2371285A
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US2008708A
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US2118602A
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US2122193A
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US2096760A
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US2173222A
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US2239042A
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US2395159A
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US2340364A
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US2369088A
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US2528457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-15 | 1956-01-14 | 1956-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-15 | 1960-01-14 | 1960-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-15 | 1964-01-14 | 1964-07-15 | $7700.00 | Window Closed / Lapsed |