US3778765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Universal check digit verifier/generator systems
Assignee: Fujitsu Services Ltd
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Filing: 1972-02-14
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Granted: 1973-12-11
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Expires: 1992-02-14
Abstract
Abstract A check digit verifying/generating system is capable of operation in a simple verifying mode using a set of predetermined weighted values and modulus. An element of universal application is afforded by an extended mode of operation in which a selected one of a number of sets of weighting values and a selected modulus is provided for dealing with input signals.
Inventors
- 👤 M Kanter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:34
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/10; G06F11/1008; G06F11/1012; G06F11/104
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
Variable check digit calculating apparatus for calculating check digits according to programmed criteria including single adding means; a recirculating accumulator connected to said adding means; means responsive to a first program input to condition the adding means to operate in a selected modulus; weighting means responsive to a second program input and to input digit signals for applying a weighting factor to each input digit to produce a resultant product; means connecting said weighting means to said adding means to pass the resultant products for a series of digits sequentially to be added according to the selected modulus and means for deriving a check digit from the accumulator.
Claim 2
Dependent Claim
108 words
Variable check digit calculating apparatus for calculating check digits according to programmed criteria including single adding means; a recirculating accumulator connected to said adding means; means responsive to a first program input to condition the adding means to operate in a selected modulus; weighting means responsive to a second program input and to input digit signals for applying a weighting factor to each input digit to produce a resultant product; means connecting said weighting means to said adding means to pass the resultant products for a series of digits sequentially to be added according to the selected modulus and means for deriving a check digit from the accumulator.
Claim 3
Dependent Claim
42 words
Apparatus as claimed in claim 1 including comparing means responsive to the check digit derived from the accumulator and to an input check digit effective to produce an error signal if the check digits applied to the comparing means do not agree.
Claim 4
Dependent Claim
55 words
Apparatus as claimed in claim 2 including column indicating means responsive to a third program input to indicate the occurrence of a final column of the input digits; an output line; and gating means responsive to the occurrence of said final column indication to permit said derived check digit to pass to said output line.
Claim 5
Dependent Claim
30 words
Apparatus as claimed in claim 3 in which the program inputs are applied column by column each in correspondence with input signals representing respectively different ones of successive input digits.
Claim 6
Dependent Claim
54 words
Apparatus as claimed in claim 3 in which each column of the program inputs corresponds to a digit representing column of a value field and in which said final column indication is produced for the final column of the value field corresponding to the position in the field arranged to contain the check digit.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |