US3728523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information system
Assignee: ABB Norden Holding AB
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Filing: 1971-12-23
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Granted: 1973-04-17
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Expires: 1991-12-23
Abstract
Abstract An information system includes an information carrier and a reading unit. The information carrier includes an inner and an outer layer, the outer layer constituting a protective casing surrounding the inner layer and hiding the information. The inner part is formed of at least one electrically conducting closed loop in which an electrical current is intended to be induced, this loop having a plurality of openings therein in the same plane. These openings are so positioned that at least two parallel current paths are produced partly in the loop. One of the current paths is decreased in its average area by at least one interruption so that the other current path will carry the main part of the current induced through the loops. A combination of these interruptions forms the information on the carrier. The reading units include an arrangement for detecting differences in the currents in said paths.
Inventors
- 👤 V Torok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:23
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/087
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
229 words
Information system comprising an information carrier and a reading unit, the information carrier comprising one inner and one outer layer, the outer layer comprising a protective casing surrounding said inner layer and hiding the information, in which the inner part of the information carrier comprises at least one electrically conducting closed loop in which an electric current is intended to be induced, said loop having a plurality of openings therein in the same plane, said openings being positioned in such a way that at least two parallel current paths are produced partially in the loop, one of said current paths being decreased in its average area by at least one interruption so that the other current path will carry the main part of the current induced through the loop, a combination of said interruptions forming the information on the carrier, the reading unit including means to detect differences in the currents in said paths, said reading unit comprising a first and a second Ushaped magnetic core, each core being provided with at least one winding, said magnetic cores being positioned with one leg of each of the two magnetic cores over the position where one of said openings appears when the information carrier is placed under the reading unit, and the other two legs of the magnetic cores being positioned outside said loop, one at each side of it.
Claim 2
Dependent Claim
229 words
Information system comprising an information carrier and a reading unit, the information carrier comprising one inner and one outer layer, the outer layer comprising a protective casing surrounding said inner layer and hiding the information, in which the inner part of the information carrier comprises at least one electrically conducting closed loop in which an electric current is intended to be induced, said loop having a plurality of openings therein in the same plane, said openings being positioned in such a way that at least two parallel current paths are produced partially in the loop, one of said current paths being decreased in its average area by at least one interruption so that the other current path will carry the main part of the current induced through the loop, a combination of said interruptions forming the information on the carrier, the reading unit including means to detect differences in the currents in said paths, said reading unit comprising a first and a second Ushaped magnetic core, each core being provided with at least one winding, said magnetic cores being positioned with one leg of each of the two magnetic cores over the position where one of said openings appears when the information carrier is placed under the reading unit, and the other two legs of the magnetic cores being positioned outside said loop, one at each side of it.
Claim 3
Dependent Claim
234 words
Information system comprising an information carrier and a reading unit, the information carrier comprising one inner and one outer layer, the outer layer comprising a protective casing surrounding said inner layer and hiding the information, in which the inner part of the information carrier comprises at least one electrically conducting closed loop in which an electric current is intended to be induced, said loop having a plurality of openings therein in the same plane, said openings being positioned in such a way that at least two parallel current paths are produced partially in the loop, one of said current paths being decreased in its average area by at least one interruption so that the other current path will carry the main part of the current induced through the loop, a combination of said interruptions forming the information on the carrier, the reading unit including means to detect differences in the currents in said paths, said reading unit comprising magnetic core means including two spaced substantiallY parallel legs, a central leg means and parts connecting each of said spaced legs to said central leg means, at least one coil operatively associated with said core means, said central leg means being positioned over the position where one of said openings appears when the information carrier is placed under the reading unit and the spaced legs being positioned outside said loop, one at each side of it.
Claim 4
Dependent Claim
234 words
Information system comprising an information carrier and a reading unit, the information carrier comprising one inner and one outer layer, the outer layer comprising a protective casing surrounding said inner layer and hiding the information, in which the inner part of the information carrier comprises at least one electrically conducting closed loop in which an electric current is intended to be induced, said loop having a plurality of openings therein in the same plane, said openings being positioned in such a way that at least two parallel current paths are produced partially in the loop, one of said current paths being decreased in its average area by at least one interruption so that the other current path will carry the main part of the current induced through the loop, a combination of said interruptions forming the information on the carrier, the reading unit including means to detect differences in the currents in said paths, said reading unit comprising magnetic core means including two spaced substantiallY parallel legs, a central leg means and parts connecting each of said spaced legs to said central leg means, at least one coil operatively associated with said core means, said central leg means being positioned over the position where one of said openings appears when the information carrier is placed under the reading unit and the spaced legs being positioned outside said loop, one at each side of it.
Claim 5
Dependent Claim
23 words
Information system according to claim 2, in which said central leg means is a single leg and said coil surrounds said single leg.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |