US3227635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing magnetic films
Assignee: International Business Machines Corp
•
Filing: 1962-01-12
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Granted: 1966-01-04
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Expires: 1982-01-12
Abstract
No abstract record available.
Inventors
- 👤 Koretzky Herman
- 👤 Leland Bernard
- 👤 Rhodes W Polleys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:20
CPC Classifications
C; C25; C25D; C25D7/00; C25D7/06; C25D7/0614; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/7368; G11B5/7371; G11B5/739; G11B5/73923; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; Y; Y10; Y10S; Y10S205/00; Y10S205/922
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR FORMING A SMOOTH DURABLE MAGNETIC FILM HAVING SUBSTANTIAL COERCIVITY BY THE STEPS OF: EXPOSING AN ELONGATED NONCONDUCTIVE CARRIER HAVING A CONDUCTIVE FILM SUPERIMPOSED ON A SURFACE THEREOF, SAID CONDUCTIVE FILM HAVING AN INITIAL RESISTANCE OF AT LEAST ONE OHM PER LINEAL INCH PER INCH OF WIDTH AS A CATHODE TO AN AQUEOUS ELECTRODEPOSITION BATH INCLUDING A SALT OF A MAGNETIC METAL. APPLYING AN ELECTRODEPOSITION CURRENT TO SAID CONDUCTIVE FILM, AND MOVING SAID CONDUCTIVE FILM CONTINUOUSLY IN THE DIRECTION OF ITS LONG DIMENSION THROUGH SAID BATH, WHEREBY EACH POINT ON SAID FILM IS SUBJECTED TO A VARYING DENSITY OF ELECTRODEPOSITION CURRENT DURING ITS TRAVEL THROUGH THE BATH.
Claim 2
Dependent Claim
109 words
A PROCESS FOR FORMING A SMOOTH DURABLE MAGNETIC FILM HAVING SUBSTANTIAL COERCIVITY BY THE STEPS OF: EXPOSING AN ELONGATED NONCONDUCTIVE CARRIER HAVING A CONDUCTIVE FILM SUPERIMPOSED ON A SURFACE THEREOF, SAID CONDUCTIVE FILM HAVING AN INITIAL RESISTANCE OF AT LEAST ONE OHM PER LINEAL INCH PER INCH OF WIDTH AS A CATHODE TO AN AQUEOUS ELECTRODEPOSITION BATH INCLUDING A SALT OF A MAGNETIC METAL. APPLYING AN ELECTRODEPOSITION CURRENT TO SAID CONDUCTIVE FILM, AND MOVING SAID CONDUCTIVE FILM CONTINUOUSLY IN THE DIRECTION OF ITS LONG DIMENSION THROUGH SAID BATH, WHEREBY EACH POINT ON SAID FILM IS SUBJECTED TO A VARYING DENSITY OF ELECTRODEPOSITION CURRENT DURING ITS TRAVEL THROUGH THE BATH.
References Cited (Backward Citations)
US1522291A
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US2619454A
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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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |