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US5933625A Expired / Lapsed US ⏱️ 0.0 years remaining

Unique time generating device and authenticating device using the same

Assignee: Individual
•
Filing: 1996-08-30
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Granted: 1999-08-03
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Expires: 2016-08-30
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Abstract

Abstract A unique time generating device is incorporated in a computer which includes a CPU (1), a memory (2) and an I/O device (3). The CPU (1) includes a timer section (4) and an accumulating section (5), and the memory (2) includes a storage section (6) for storing a preset time-measuring period and a renewal section (7) for renewing the time-measuring period. The storage section (6) stores therein a total of time values Tt to be counted over the time-measuring period, which may, for example, be 3,155,692,500.97 seconds corresponding to a 100 year period. The timer section (4) constantly counts the total time value, and the accumulating section (5) calculates an accumulated time Tn progressively incrementing from the zeroth second toward the designated total time value Tt and a subtracted time (Tt-Tn) progressively decrementing from the total time value toward the zeroth second, so as to constantly measure an elapsed time within the preset period. Via the I/O device (3), such an elapsed time measured by the unique time generating device can be supplied to another computer, and an elapsed time measured by the other computer can be supplied to the unique time generating device.

Inventors

  • 👤 Akira Sugiyama

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 23:59
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/30; G06F21/31; G06F21/33; G06F1/00; G06F1/04; G06F1/14; G06F21/70; G06F21/71; G06F21/72; G06F21/725; H; H04; H04L; H04L69/00; H04L69/28

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 86 words
A device for providing a time reference in computers that are produced at different points in time, comprising: timer means for generating periodic timer signals; and accumulating means for counting a number of timer signals outputted by said timer means within a preset time-measuring period that begins at a given starting point on a selected date and terminates at a given future ending point, wherein each of said computers counts timer signals within a time-measuring period having a unique starting point and a unique ending point.
Claim 2
Independent Claim 86 words
A device for providing a time reference in computers that are produced at different points in time, comprising: timer means for generating periodic timer signals; and accumulating means for counting a number of timer signals outputted by said timer means within a preset time-measuring period that begins at a given starting point on a selected date and terminates at a given future ending point, wherein each of said computers counts timer signals within a time-measuring period having a unique starting point and a unique ending point.
Claim 3
Dependent Claim 28 words
A device as defined in claim 1 wherein respective starting points of the time-measuring periods allocated to said computers are different from each other by a predetermined interval.
Claim 4
Dependent Claim 33 words
A device as defined in claim 1 wherein respective time-measuring periods allocated to said computers begin at a same starting point but have respective durations differing from each other by a predetermined length.
Claim 5
Dependent Claim 27 words
A device as defined in claim 1 wherein a unique starting point of a time measuring period of a computer corresponds to a manufacturer of the computer.
Claim 6
Independent Claim 87 words
A device in a CPU for providing a time reference in computers that are produced at successive points in time, comprising: timer means for generating periodic timer signals; and accumulating means for counting a number of timer signals outputted by said timer means within a preset time-measuring period that begins at a given starting point on a selected date and terminates at a given future ending point, wherein each of said computers counts timer signals within a time-measuring period having the same starting point and ending point.
Claim 7
Independent Claim 87 words
A device in a CPU for providing a time reference in computers that are produced at successive points in time, comprising: timer means for generating periodic timer signals; and accumulating means for counting a number of timer signals outputted by said timer means within a preset time-measuring period that begins at a given starting point on a selected date and terminates at a given future ending point, wherein each of said computers counts timer signals within a time-measuring period having the same starting point and ending point.
Claim 8
Dependent Claim 36 words
A device as defined in claim 5 wherein communication between two or more of the computers is conducted using a common number of timer signals counted by the respective accumulating means of each of the computers.
Claim 9
Dependent Claim 44 words
A device as defined in claim 5, wherein a communication from a first computer to a second computer controls a device connected to the second computer using a common number of timer signals counted by the respective accumulating means of each of the computers.

References Cited (Backward Citations)

US5795161A Cited
US5444780A Cited
US5564038A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2002-08-02 2003-02-01 2003-08-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2006-08-02 2007-02-01 2007-08-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2010-08-02 2011-02-01 2011-08-03 $7700.00 Window Closed / Lapsed

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