Patent US2885365A successfully refreshed from Google Patents.
US2885365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ruthenium-modified chromium oxide ferromagnetic compositions, their pre-aration and use
Assignee: EIDP Inc
•
Filing: 1956-10-22
•
Granted: 1959-05-05
•
Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Alfred L Oppegard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:54
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A RUTHENIUM-MODIFIED CHROMIUM OXIDE FERROMAGNETIC COMPOSITION CONTAINING 58.4% TO 61.9% CHROMIUM COMBINED WITH OXYGEN AND 0.008% TO 4.4% RUTHENIUM COMBINED WITH OXYGEN, AND CONSISTING ESSENTILLY OF SMALL ACICULAR PARTICLES OF TETRAGONAL CRYSTAL STRUCTURE HAVING AN AVERAGE LENGTH OF NOT MORE THAN 2 MICRONS.
Claim 2
Dependent Claim
43 words
A RUTHENIUM-MODIFIED CHROMIUM OXIDE FERROMAGNETIC COMPOSITION CONTAINING 58.4% TO 61.9% CHROMIUM COMBINED WITH OXYGEN AND 0.008% TO 4.4% RUTHENIUM COMBINED WITH OXYGEN, AND CONSISTING ESSENTILLY OF SMALL ACICULAR PARTICLES OF TETRAGONAL CRYSTAL STRUCTURE HAVING AN AVERAGE LENGTH OF NOT MORE THAN 2 MICRONS.
References Cited (Backward Citations)
US2699408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |