US2535479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic pickup
Assignee: Duracell Inc USA
•
Filing: 1947-05-20
•
Granted: 1950-12-26
•
Expires: 1967-05-20
Abstract
No abstract record available.
Inventors
- 👤 Robert J Aust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:48
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB276466A
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US1835073A
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GB333895A
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GB337811A
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FR725264A
Cited
GB445423A
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US2105167A
Cited
US2241105A
Cited
US2326424A
Cited
US2416082A
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US2429137A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |