US2977312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferromagnetic material
Assignee: US Philips Corp
•
Filing: 1957-05-16
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Granted: 1961-03-28
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Expires: 1977-05-16
Abstract
No abstract record available.
Inventors
- 👤 Gorter Evert Willem
- 👤 Jonker Gerard Heinrich
- 👤 Wijn Henricus Petrus Johannes
- 👤 Schulkes Johannes Antonius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:12
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2633; C04B35/2616; C04B35/2625; C04B35/2641; C04B35/2683
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A FERROMAGNETIC MATERIAL SUITABLE FOR USE AT FREQUENCIES UP TO 200 MEGACYCLES PER SECOND AND HIGHER CONSISTING ESSENTIALLY OF CRYSTALS HAVING A COMPOSITION:
Claim 2
Dependent Claim
23 words
A FERROMAGNETIC MATERIAL SUITABLE FOR USE AT FREQUENCIES UP TO 200 MEGACYCLES PER SECOND AND HIGHER CONSISTING ESSENTIALLY OF CRYSTALS HAVING A COMPOSITION:
References Cited (Backward Citations)
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US2677663A
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US2847101A
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US2762778A
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Cited
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Cited
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Cited
US2837483A
Cited
US2854412A
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |