US3585141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of chromium dioxide by monomeric cyclic amines
Assignee: EIDP Inc
•
Filing: 1969-05-05
•
Granted: 1971-06-15
•
Expires: 1989-05-05
Abstract
Abstract MONOMERIC AROMATIC HETEROCYCLIC TERTIARY AMINES AND THE ALKYL, ARYL, AROYL, CARBOXY ACID, CARBOXY ESTER, OR CYANO DERIVATIVES THEREOF, SAID AMINES AND DERIVATIVES CHARACTERIZED BY A MOLECULAR WEIGHT OF AT LEAST 150 A MELTING POINT OF AT LEAST 50*C., ARE ADMIXED IN STABILIZING AMOUNTS WITH FERROMAGENTIC CRO2 PARTICLES AND INCORPORATED WITH A POLYMER BINDER TO RETARD LOSS OF RESIDUAL INTRINSIC FLUX DENSITY OF MAGENTIC RECORDING MEMBER, E.G., TAPES, DISCS, AND CYLINDERS HAVING A LAYER OF THE FERROMAGNETIC CRO2 COMPOSITIONS.
Inventors
- 👤 Henry Gilbert Ingersoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:50
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7028; G11B5/706; G11B5/70626; G11B5/70636; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |