US3199091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer controlled file protect
Assignee: International Business Machines Corp
•
Filing: 1960-01-07
•
Granted: 1965-08-03
•
Expires: 1980-01-07
Abstract
No abstract record available.
Inventors
- 👤 Earl D Barkhuff
- 👤 Henry E Childs
- 👤 Frederick A Schultz
- 👤 Donald N Streeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:57
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A COMPUTER SYSTEM INCLUDING A MAGNETIC TAPE UNIT HAVING A CARTRIDGE FOR CARRYING A MAGNETIC TAPE THEREIN AND A TAPE TRANSPORT FOR RECEIVING SAID CARTRIDGE, AN ERASE CIRCUIT FOR COACTIONW ITH SAID MAGNETIC TAPE, A TWO POSITION ERASE CIRCUIT CONTROL SWITCH MOUNTED ON SAID TRANSPORT FOR CONTROLLING THE COMMISSIONING OF SAID ERASE CIRCUIT IN A FIRST POSITION AND THE DECOMMISSIONING OF SAID ERASE CIRCUIT IN A SECOND POSITION, A TWO POSITION SWITCH CONTROLLER MOUNTED ON SAID CARTRIDGE IN OPERATING RELATION TO SAID CONTROL SWITCH WHEREBY WHEN SAID CONTROLLER IS IN A FIRST POSITION SAID CONTROL SWITCH IS IN ITS FIRST POSITION AND WHEN SAID CONTROLLER IS IN ITS SECOND POSITION SAID CONTROL SWITCH IS IN ITS SECOND POSITION, A SOLENOID INCLUDING AN ACTUATOR MOUNTED ON SAID TRANSPORT, SAID ACTUATOR BEING IN A POSITION TO OPERATE SAID CONTROLLER TO CHANGE THE POSITION OF SAID CONTROL SWITCH WHEN SAID SOLENOID IS ENERGIZED, AND MEANS UNDER CONTROL OF SAID COMPUTER FOR ENERGIZED SAID SOLENOID.
Claim 2
Dependent Claim
162 words
IN A COMPUTER SYSTEM INCLUDING A MAGNETIC TAPE UNIT HAVING A CARTRIDGE FOR CARRYING A MAGNETIC TAPE THEREIN AND A TAPE TRANSPORT FOR RECEIVING SAID CARTRIDGE, AN ERASE CIRCUIT FOR COACTIONW ITH SAID MAGNETIC TAPE, A TWO POSITION ERASE CIRCUIT CONTROL SWITCH MOUNTED ON SAID TRANSPORT FOR CONTROLLING THE COMMISSIONING OF SAID ERASE CIRCUIT IN A FIRST POSITION AND THE DECOMMISSIONING OF SAID ERASE CIRCUIT IN A SECOND POSITION, A TWO POSITION SWITCH CONTROLLER MOUNTED ON SAID CARTRIDGE IN OPERATING RELATION TO SAID CONTROL SWITCH WHEREBY WHEN SAID CONTROLLER IS IN A FIRST POSITION SAID CONTROL SWITCH IS IN ITS FIRST POSITION AND WHEN SAID CONTROLLER IS IN ITS SECOND POSITION SAID CONTROL SWITCH IS IN ITS SECOND POSITION, A SOLENOID INCLUDING AN ACTUATOR MOUNTED ON SAID TRANSPORT, SAID ACTUATOR BEING IN A POSITION TO OPERATE SAID CONTROLLER TO CHANGE THE POSITION OF SAID CONTROL SWITCH WHEN SAID SOLENOID IS ENERGIZED, AND MEANS UNDER CONTROL OF SAID COMPUTER FOR ENERGIZED SAID SOLENOID.
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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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |