US2533689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic focusing device
Assignee: QUAM NICHOLS Co
•
Filing: 1950-06-28
•
Granted: 1950-12-12
•
Expires: 1970-06-28
Abstract
No abstract record available.
Inventors
- 👤 James P Quam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:28
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J29/64; H01J29/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2224933A
Cited
US2102421A
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GB472165A
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US2212206A
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US2219193A
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US2200039A
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US2305761A
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US2336837A
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FR848180A
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GB521439A
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FR871483A
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US2234720A
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US2442975A
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US2431077A
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US2416687A
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US2418487A
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US2433682A
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US2443973A
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GB597255A
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US2456399A
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US2440403A
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US2494459A
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GB615553A
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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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |