US2636860A
Expired / Lapsed
US
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Magnetic core
Assignee: Hartford National Bank and Trust Co
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Filing: 1946-04-10
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Granted: 1953-04-28
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Expires: 1966-04-10
Abstract
No abstract record available.
Inventors
- 👤 Snoek Jacob Louis
- 👤 Went Jan Jacobus
- 👤 Haayman Pieter Willem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A SOFT FERROMAGNETIC MATERIAL CONSISTING ESSENTIALLY OF SUBSTANTIALLY HOMOGENEOUS MIXED CRYSTALS OF MANGANESE-ZINC-FERROUS FERRITE, SAID FERRITE HAVING THE FORMULA
Claim 2
Dependent Claim
19 words
A SOFT FERROMAGNETIC MATERIAL CONSISTING ESSENTIALLY OF SUBSTANTIALLY HOMOGENEOUS MIXED CRYSTALS OF MANGANESE-ZINC-FERROUS FERRITE, SAID FERRITE HAVING THE FORMULA
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) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |