Patent US3576573A successfully refreshed from Google Patents.
US3576573A
Expired / Lapsed
US
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System for selecting a substitute electrically operated element
Assignee: International Business Machines Corp
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Filing: 1968-09-23
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Granted: 1971-04-27
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Expires: 1988-09-23
Abstract
Abstract A system for selecting an electrical element of a group of like elements includes a sensor that responds to a combination of signals, such signals being directed to energizing a selected element. In the event that the selected element becomes defective or nonoperative, then a logic system is adjusted to change the signal combination to the sensor, so as to block energization of such defective element, and to substitute another like operative element.
Inventors
- 👤 Charles V Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:03
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; F; F21; F21V; F21V27/00; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/20; G11B5/00; G11B5/02; G11C; G11C29/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
367 words
In an apparatus having a multiplicity of normally operational magnetic head elements wherein any one of such operational elements is to be selected for operation in response to an address signal comprising: a plurality of racks, each of said racks having a plurality of shoes connected to said rack, each of said shoes having a plurality of normally operational magnetic head elements connected to said shoe; an address register for storing the address of said operational element to be selected; a plurality of spare magnetic head elements, the number of said spare elements being equal to or less than the number of said shoes and each said shoe having one or none of said spare elements connected to said shoe; a first selection means connected to said address register for selecting said operational element addressed in said address register, said first selection means having a plurality of element drivers, a plurality of shoe drivers and a plurality of rack drivers connected respectively to said rack, shoes and operational element; a conversion means for converting the address of any of said operational elements to the address of any said spare element, said conversion means converting the address of said address operational element into the address of said spare element whenever a bad address is detected in said address register by said conversion means; an inhibit means for inhibiting selection by said first selection means of said addressed operational element in the said address register whenever a bad address is detected as being stored in said address register by said conversion means, said inhibit means further activating a spare element driver which is connected to all said spare elements in said apparatus; and a second selection means connected to said conversion means for completing selection of said spare element as dictated by said conversion means, said second selection means connected in common with the plurality of shoe drivers and the plurality of rack drivers associated with the said first selection means, the combination of said second selection means and said inhibit means causing said spare element indicated by said conversion means to be fully selected and made operational in place of the operational element addressed in said address register.
Claim 2
Dependent Claim
367 words
In an apparatus having a multiplicity of normally operational magnetic head elements wherein any one of such operational elements is to be selected for operation in response to an address signal comprising: a plurality of racks, each of said racks having a plurality of shoes connected to said rack, each of said shoes having a plurality of normally operational magnetic head elements connected to said shoe; an address register for storing the address of said operational element to be selected; a plurality of spare magnetic head elements, the number of said spare elements being equal to or less than the number of said shoes and each said shoe having one or none of said spare elements connected to said shoe; a first selection means connected to said address register for selecting said operational element addressed in said address register, said first selection means having a plurality of element drivers, a plurality of shoe drivers and a plurality of rack drivers connected respectively to said rack, shoes and operational element; a conversion means for converting the address of any of said operational elements to the address of any said spare element, said conversion means converting the address of said address operational element into the address of said spare element whenever a bad address is detected in said address register by said conversion means; an inhibit means for inhibiting selection by said first selection means of said addressed operational element in the said address register whenever a bad address is detected as being stored in said address register by said conversion means, said inhibit means further activating a spare element driver which is connected to all said spare elements in said apparatus; and a second selection means connected to said conversion means for completing selection of said spare element as dictated by said conversion means, said second selection means connected in common with the plurality of shoe drivers and the plurality of rack drivers associated with the said first selection means, the combination of said second selection means and said inhibit means causing said spare element indicated by said conversion means to be fully selected and made operational in place of the operational element addressed in said address register.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |