US2622885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record changing apparatus
Assignee: Zenith Electronics LLC
•
Filing: 1946-02-21
•
Granted: 1952-12-23
•
Expires: 1966-02-21
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Mullaney
- 👤 Herbert H Steglich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:47
CPC Classifications
G; G11; G11B; G11B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1454134A
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US2068449A
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US2063199A
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US2043789A
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FR822026A
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GB541156A
Cited
US2355790A
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US2318654A
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US2435264A
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US2374080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |