Patent US3586630A successfully refreshed from Google Patents.
US3586630A
Expired / Lapsed
US
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Stabilization of chromium dioxide by organophosphorus compounds
Assignee: EIDP Inc
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Filing: 1969-05-08
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Granted: 1971-06-22
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Expires: 1989-05-08
Abstract
Abstract ORGANOPHOSPHOROUS COMPOUNDS TAKEN FROM THE GROUP CONSISTING OF PHOSPHINES, PHOSPHINE OXIDES, AND PHOSPHORUS ESTERS, WHEREIN NO -OH GROUP IS ATTACHED DIRECTLY TO A P ATOM, ADMIXED IN STABILIZING AMOUNTS WITH CRO2 PARTICLES AND INCORPORATED WITH A POLYMER BINDER THEREBY RETARDING LOSS OF RESIDUAL INTRINSIC FLUX DENSITY IN MAGNETIC RECORDING MEMBERS CONTAINING THE FERROMAGNETIC CRO2 COMPOSITIONS.
Inventors
- 👤 Henry Gilbert Ingersoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636; G11B5/7013
Claims Analysis
Total Claims: 0
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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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |