US2552757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: SENTINEL RADIO Corp
•
Filing: 1946-05-02
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Granted: 1951-05-15
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Expires: 1966-05-02
Abstract
No abstract record available.
Inventors
- 👤 Harold J Adler
- 👤 Matthew Z Mroz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:05
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/08; G11B3/09; G11B3/093; G11B19/00; G11B19/02; G11B19/16; G11B19/165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |