Patent US2805351A successfully refreshed from Google Patents.
US2805351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet system for producing a magnetic field
Assignee: US Philips Corp
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Filing: 1953-09-04
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Granted: 1957-09-03
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Expires: 1973-09-04
Abstract
No abstract record available.
Inventors
- 👤 Niklas Wilfrid Franz Ko Johann
- 👤 Jan Van Wijngaarden
- 👤 Alphonsus Petrus Van Rooy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:45
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/84; H01J29/46; H01J29/54
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) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |