US2956955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferromagnetic chromium oxide and method of making
Assignee: EIDP Inc
•
Filing: 1960-02-12
•
Granted: 1960-10-18
•
Expires: 1980-02-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:58
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A FERROMAGNETIC COMPOSITION OF UNIFORM SMALL PARTICLES OF FERROMAGNETIC CHROMIUM OXIDE CONSISTING ENTIRELY OF TETRAGONAL CRYSTAL STRUCTURE HAVING AN AVERAGE LENGTH OF NOT MORE THAN 10 MICRONS WITH NO MORE THAN 10% OF SAID PARTICLES BEING LONGER THAN 10 MICRONS, THE SAID FERROMAGNETIC CHROMIUM OXIDE PARTICLES CONTAINING BY ANALYSIS 58.9 TO 61.9% CHROMIUM AND WHEN EXPOSED TO X-RAYS EXHIBITING AN X-RAY DIFFRACTION PATTERN WHICH IN ITS ENTIRETY CORRESPONDS TO A TETRAGONAL CRYSTAL STRUCTURE HAVING CELL CONSTANTS OF AO=4.41$0.10 A. AND
Claim 2
Dependent Claim
80 words
A FERROMAGNETIC COMPOSITION OF UNIFORM SMALL PARTICLES OF FERROMAGNETIC CHROMIUM OXIDE CONSISTING ENTIRELY OF TETRAGONAL CRYSTAL STRUCTURE HAVING AN AVERAGE LENGTH OF NOT MORE THAN 10 MICRONS WITH NO MORE THAN 10% OF SAID PARTICLES BEING LONGER THAN 10 MICRONS, THE SAID FERROMAGNETIC CHROMIUM OXIDE PARTICLES CONTAINING BY ANALYSIS 58.9 TO 61.9% CHROMIUM AND WHEN EXPOSED TO X-RAYS EXHIBITING AN X-RAY DIFFRACTION PATTERN WHICH IN ITS ENTIRETY CORRESPONDS TO A TETRAGONAL CRYSTAL STRUCTURE HAVING CELL CONSTANTS OF AO=4.41$0.10 A. AND
References Cited (Backward Citations)
US2694656A
Cited
US2770523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |