US3860451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a magnetic substrate
Assignee: ConocoPhillips Co
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Filing: 1973-01-02
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Granted: 1975-01-14
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Expires: 1993-01-02
Abstract
Abstract An improved method for preparing a substrate having magnetically sensitive particles on the surface thereof by impregnating the surface with a metal salt or oxide of a magnetically sensitive metal wherein the improvement comprises reducing the metal salt or oxide to metal in situ with an aluminum trialkyl or an alkyl aluminum hydride compound.
Inventors
- 👤 Charles M Starks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:04
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/24; C; C23; C23C; C23C18/00; C23C18/02; C23C18/08; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN A METHOD FOR PREPARING A FLEXIBLE SUBSTRATE HAVING MAGNETICALLY SENSITIVE PARTICLES ON THE SURFACE THEREOF BY IMPREGNATING THE SURFACE WITH A SALT OR OXIDE OF IRON AND THEREAFTER REDUCING SAID SALT OR OXIDE IN SITU TO MAGNETIC IRON, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REDUCTION OF SAID SALT OR OXIDE WITH ALUMINUM TRIETHYL, DIETHYL ALUMINUM HYDRIDE OR MIXTURE THEREOF.
Claim 2
Dependent Claim
61 words
IN A METHOD FOR PREPARING A FLEXIBLE SUBSTRATE HAVING MAGNETICALLY SENSITIVE PARTICLES ON THE SURFACE THEREOF BY IMPREGNATING THE SURFACE WITH A SALT OR OXIDE OF IRON AND THEREAFTER REDUCING SAID SALT OR OXIDE IN SITU TO MAGNETIC IRON, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REDUCTION OF SAID SALT OR OXIDE WITH ALUMINUM TRIETHYL, DIETHYL ALUMINUM HYDRIDE OR MIXTURE THEREOF.
References Cited (Backward Citations)
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |