Patent US3523836A successfully refreshed from Google Patents.
US3523836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet constituted of fine particles of a compound m5r
Assignee: US Philips Corp
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Filing: 1968-01-19
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Granted: 1970-08-11
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Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 Kurt Heinz Juergen Buschow
- 👤 Wilhelmus Antonius Johan Velge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:08
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; C; C22; C22C; C22C19/00; C22C28/00; C22C9/00; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2813789A
Cited
US3102002A
Cited
US3326637A
Cited
US3342591A
Cited
US3421889A
Cited
US3424578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |