US4242789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making an improved magnetic encoding device
Assignee: United States Department of Energy
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Filing: 1979-03-16
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Granted: 1981-01-06
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Expires: 1999-03-16
Abstract
Abstract A magnetic encoding device and method for making the same are provided for use as magnetic storage mediums in identification control applications which give output signals from a reader that are of shorter duration and substantially greater magnitude than those of the prior art. Magnetic encoding elements are produced by uniformly bending wire or strip stock of a magnetic material longitudinally about a common radius to exceed the elastic limit of the material and subsequently mounting the material so that it is restrained in an unbent position on a substrate of nonmagnetic material. The elements are spot weld attached to a substrate to form a binary coded array of elements according to a desired binary code. The coded substrate may be enclosed in a plastic laminate structure. Such devices may be used for security badges, key cards, and the like and may have many other applications.
Inventors
- 👤 Richard J. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:51
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/02; G06K19/06; G06K19/08; G06K19/10; G06K19/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49906
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A method of making an improved magnetic encoding device having at least one element of magnetic material for use as a magnetic storage medium, comprising the steps of: bending said element uniformly along the length thereof by passing said element about a roller having a radius sufficient to bend said element along a common radius of curvature sufficient to exceed the yield point of said element; attaching the free end of said element passing about said roller to a non-magnetic substrate; advancing said roller over said substrate to extend said element in an unbent orientation a desired length thereover; and restraining the prebent element in an unbent orientation on said substrate by attaching said element to said substrate at said desired length position so that a uniform stress is produced in said element along said desired length thereof.
Claim 2
Independent Claim
138 words
A method of making an improved magnetic encoding device having at least one element of magnetic material for use as a magnetic storage medium, comprising the steps of: bending said element uniformly along the length thereof by passing said element about a roller having a radius sufficient to bend said element along a common radius of curvature sufficient to exceed the yield point of said element; attaching the free end of said element passing about said roller to a non-magnetic substrate; advancing said roller over said substrate to extend said element in an unbent orientation a desired length thereover; and restraining the prebent element in an unbent orientation on said substrate by attaching said element to said substrate at said desired length position so that a uniform stress is produced in said element along said desired length thereof.
Claim 3
Dependent Claim
20 words
The method as set forth in claim 1 wherein said elements comprise lengths of wire formed of a magnetic material.
Claim 4
Dependent Claim
28 words
The method as set forth in claim 1 wherein said elements comprise lengths of strips formed of a magnetic material having a length greater than the width thereof.
Claim 5
Dependent Claim
51 words
The method as set forth in claim 1 wherein said at least one element includes a plurality of elements and further comprising the steps of repeating the steps of claim 1 at selected parallel bit positions along said substrate to produce a desired binary coded array of elements on said substrate.
Claim 6
Dependent Claim
105 words
The method as set forth in claim 4 wherein said substrate is in the form of an elongated strip and said bit positions extend transversely of said substrate and wherein said elements for bit positions indicative of a first binary state extend from one edge of said strip to a point substantially greater than half the distance across said substrate, and said elements for bit positions indicative of a second binary state extend from the other edge of said substrate to a point substantially greater than half the distance across said substrate to form a partially interleaved binary coded array of elements on said substrate.
Claim 7
Dependent Claim
35 words
The method as set forth in claim 5 wherein said substrate is formed of an electrically conductive material and said elements are attached to said substrate by spot welding their respective ends to said substrate.
Claim 8
Dependent Claim
20 words
The method as set forth in claim 6 further including the step of enclosing said substrate in a laminated covering.
Claim 9
Dependent Claim
22 words
The method as set forth in claim 7 wherein said magnetic material is Vicalloy and said substrate is made of stainless steel.
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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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |