# US 9,038,909 B2 · Printer side verification mechanism > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,038,909 B2 - Document ID: US9038909B2 - Status: Granted - Kind: B2 - Application number: 12/604,826 - Filed: 2009-10-23 - Published: 2011-04-28 - Granted: 2015-05-26 - Earliest claimed: 2009-10-23 - Assignees: InfoPrint Solutions Company LLC - Applicants: Stephen Goddard Price; James A. Krack; Samuel Neely Hopper - Inventors: Stephen Goddard Price; James A. Krack; Samuel Neely Hopper - Web page: https://patentgrep.com/patent/US9038909B2 ## CPC - G06K 15/16: Means for paper feeding or form feeding - B41J 3/01: for special character, e.g. for Chinese characters or barcodes - B41J 3/60: for printing on both faces of the printing material - G06K 15/021: {Adaptations for printing on specific media} - G06K 17/0016: {Selecting or retrieving of images by means of their associated code-marks, e.g. coded microfilm or microfiche (microfilm reading G03B21/11; computers therefor G06F16/00; teaching devices G09B5/02; accessing record carriers G11B27/002; static digital stores using optical elements G11C13/04; intermediate storage of facsimile picture signals H04N1/21)} - G06K 2215/0094: Colour printing - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract A method includes generating a machine readable code using each ink color implemented at a printer, printing the machine readable code on a first side of the medium, analyzing the machine readable code printed on the first side of the medium at a verification unit and detecting a side mismatch if the verification unit does not verify the machine readable code printed on the first side of the medium. ## Claims ### Claim 1 A method comprising: generating a machine readable code having multi-color marks including each ink color implemented at a printer; printing the machine readable code on a first side of a medium; analyzing the machine readable code printed on the first side of the medium at a verification unit; and detecting an error if the verification unit does not verify that each color of the multi-color marks is readable. ### Claim 2 (depends on 1) The method of claim 1 further comprising: printing the machine readable code on a second side of the medium; analyzing the machine readable code printed on the second side of the medium at the verification unit; and detecting an error if the verification unit does not verify that each color of the machine readable code is readable on the second side of the medium. ### Claim 3 (depends on 2) The method of claim 2 wherein analyzing the machine readable code at the verification unit comprises: reading the machine readable code printed on the first side of the medium at a first reader; and reading the machine readable code printed on the second side of the medium at a second reader. ### Claim 4 (depends on 3) The method of claim 3 further comprising: comparing the machine readable code printed on the first side of the medium with the machine readable code printed on the second side of the medium; and detecting a side mismatch if the machine readable code printed on the first side of the medium does not match the machine readable code printed on the second side of the medium. ### Claim 5 (depends on 1) The method of claim 1 wherein the machine readable code comprises a barcode. ### Claim 6 (depends on 5) The method of claim 5 wherein printing the barcode comprises varying colors for each character in a string of characters comprising the barcode. ### Claim 7 (depends on 5) The method of claim 5 wherein printing the barcode comprises varying colors for each bar comprising the barcode. ### Claim 8 (depends on 5) The method of claim 5 wherein printing the barcode comprises varying color segments in each bar of the barcode. ### Claim 9 (depends on 5) The method of claim 5 wherein a density is specified for each color printed in the barcode. ### Claim 10 (depends on 1) The method of claim 1 wherein the machine readable code comprises modulated-size marks. ### Claim 11 (depends on 10) The method of claim 10 wherein each mark comprises contiguous strips of color. ### Claim 12 A printer comprising: a first print head to print a machine readable code on a first side of a medium; and a side verification unit to generate the machine readable code having multi-color marks including each ink color implemented at a printer, analyze the machine readable code printed on the first side of the medium and detect an error if the verification unit does not verify that each color of the multi-color marks is readable. ### Claim 13 (depends on 12) The printer of claim 12 wherein the printer further comprises a second print head to print the machine readable code on a second side of the medium. ### Claim 14 (depends on 13) The printer of claim 13 wherein the side verification unit comprises: a verification unit, including: a first reader to read the machine readable code printed on the first side of the medium; and a second reader to read the machine readable code printed on the second side of the medium; and a control unit to determine that the machine readable code is detected at the first and second readers. ### Claim 15 (depends on 14) The printer of claim 14 wherein the control unit further compares the machine readable code printed on the first side of the medium with the machine readable code printed on the second side of the medium and detects a side mismatch if the machine readable code printed on the first side of the medium does not match the machine readable code printed on the second side of the medium. ### Claim 16 (depends on 13) The printer of claim 13 wherein the machine readable code is a barcode. ### Claim 17 (depends on 16) The printer of claim 16 wherein the barcode comprises varying colors for each character in a string of characters comprising the barcode. ### Claim 18 (depends on 16) The printer of claim 16 wherein the barcode comprises varying colors for each bar comprising the barcode. ### Claim 19 (depends on 16) The printer of claim 16 wherein the barcode comprises varying color segments in each bar of the barcode. ### Claim 20 (depends on 16) The printer of claim 16 wherein a density is specified for each color printed in the barcode. ### Claim 21 (depends on 13) The printer of claim 13 wherein the machine readable code is modulated-size marks. ### Claim 22 (depends on 21) The printer of claim 21 wherein each mark comprises contiguous strips of color. ### Claim 23 An article of manufacture comprising a machine-readable medium including data that, when accessed by a machine, cause the machine to perform operations comprising: generating a machine readable code having multi-color marks of including each ink color implemented at a printer; printing the machine readable code on a first side of a medium; analyzing the machine readable code printed on the first side of the medium at a verification unit; and detecting an error if the verification unit does not verify that each color of the multi-color marks is readable. ### Claim 24 (depends on 23) The article of manufacture of claim 23 including data that, when accessed by the machine, cause the machine to perform further operations comprising: printing the machine readable code on a second side of the medium; analyzing the machine readable code printed on the second side of the medium at the verification unit; and detecting a side mismatch if the verification unit does not verify that each color of the machine readable code is readable on the second side of the medium. ### Claim 25 (depends on 24) The article of manufacture of claim 24 wherein analyzing the machine readable code at the verification unit comprises: reading the machine readable code printed on the first side of the medium at a first reader; and reading the machine readable code printed on the second side of the medium at a second reader. ### Claim 26 (depends on 25) The article of manufacture of claim 25 wherein the machine-accessible medium includes data that causes the machine to perform further operations comprising: comparing the machine readable code printed on the first side of the medium with the machine readable code printed on the second side of the medium; and detecting a side mismatch if the machine readable code printed on the first side of the medium does not match the machine readable code printed on the second side of the medium. ### Claim 27 (depends on 24) The article of manufacture of claim 24 wherein the machine readable code comprises a barcode. ### Claim 28 (depends on 24) The article of manufacture of claim 24 wherein the machine readable code comprises modulated-size marks.