TREA

with invisibly printed correct answer; the answer being rendered visible by special optical means

Follow

Industry

  • CPC
  • G09B3/085
This industry / category may be too specific. Please go to a parent level for more data

Parent Industries

GPHYSICS G09Cryptography, education, displays G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE MODELS PLANETARIA GLOBES MAPS DIAGRAMS G09B3/00Manually or mechanically operated teaching appliances working with questions and answers

Current Industry

G09B3/085with invisibly printed correct answer; the answer being rendered visible by special optical means
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Image processing apparatus and image processing method for appropri...
    • Patent number 9,357,099
    • Issue date May 31, 2016
    • KYOCERA Document Solutions Inc.
    • Toru Honda
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Method and apparatus for multiple choice testing system with immedi...
    • Patent number 6,210,171
    • Issue date Apr 3, 2001
    • Michael L. Epstein
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Test booklet including tear out answer sheets having scratch-off an...
    • Patent number 5,924,740
    • Issue date Jul 20, 1999
    • Enterprises for Continuing Education, Inc.
    • Lois E. Romans
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Multicolor interactive notepad
    • Patent number 4,787,852
    • Issue date Nov 29, 1988
    • David W. Melnick
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Programmed learning textbook
    • Patent number 4,552,536
    • Issue date Nov 12, 1985
    • Andrew F. Kay
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Invisible ink quiz game
    • Patent number 4,514,177
    • Issue date Apr 30, 1985
    • Stry-Lenkoff Co.
    • Leon G. Lenkoff
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Self-scoring test with non-disclosed key
    • Patent number 4,337,051
    • Issue date Jun 29, 1982
    • Thomas Donlon
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Optically scannable answer sheet booklet with sequence bars printed...
    • Patent number 4,300,791
    • Issue date Nov 17, 1981
    • National Computer Systems, Inc.
    • James B. Bohrer
    • B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER
  • Information Patent Grant

    Apparatus for determining the result of answers to a set of related...
    • Patent number 4,213,251
    • Issue date Jul 22, 1980
    • National Research Development Corporation
    • Stavros Foundos
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    System for visual communication
    • Patent number 4,084,332
    • Issue date Apr 18, 1978
    • John S. Waloszyk
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Element and method for teaching with liquid crystals
    • Patent number 4,038,761
    • Issue date Aug 2, 1977
    • A. B. Dick Company
    • Richard E. Thomas
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Xerographic method for making a responsive answer system
    • Patent number 3,938,993
    • Issue date Feb 17, 1976
    • Xerox Corporation
    • Stephen F. Royka
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    3877155
    • Patent number 3,877,155
    • Issue date Apr 15, 1975
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    3823022
    • Patent number 3,823,022
    • Issue date Jul 9, 1974
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3789520
    • Patent number 3,789,520
    • Issue date Feb 5, 1974
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3617324
    • Patent number 3,617,324
    • Issue date Nov 2, 1971
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3516177
    • Patent number 3,516,177
    • Issue date Jun 23, 1970
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3511656
    • Patent number 3,511,656
    • Issue date May 12, 1970
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3499235
    • Patent number 3,499,235
    • Issue date Mar 10, 1970
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3451143
    • Patent number 3,451,143
    • Issue date Jun 24, 1969
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3451779
    • Patent number 3,451,779
    • Issue date Jun 24, 1969
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3359656
    • Patent number 3,359,656
    • Issue date Dec 26, 1967
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3354558
    • Patent number 3,354,558
    • Issue date Nov 28, 1967
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3327406
    • Patent number 3,327,406
    • Issue date Jun 27, 1967
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3323231
    • Patent number 3,323,231
    • Issue date Jun 6, 1967
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3302306
    • Patent number 3,302,306
    • Issue date Feb 7, 1967
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3300879
    • Patent number 3,300,879
    • Issue date Jan 31, 1967
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3281960
    • Patent number 3,281,960
    • Issue date Nov 1, 1966
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3280483
    • Patent number 3,280,483
    • Issue date Oct 25, 1966
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    3248808
    • Patent number 3,248,808
    • Issue date May 3, 1966
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS

Patents Applicationslast 30 patents