US2542534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tone arm
Assignee: PFANSTIEHL CHEMICAL CO
•
Filing: 1945-01-23
•
Granted: 1951-02-20
•
Expires: 1965-01-23
Abstract
No abstract record available.
Inventors
- 👤 Robert S John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:17
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1475277A
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GB307091A
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GB322663A
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GB328039A
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US1830800A
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FR752864A
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US1996104A
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GB418373A
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US2060117A
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US2133596A
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US2308795A
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US2236599A
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US2331122A
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US2313126A
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US2329526A
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US2326424A
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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) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |