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  • CPC
  • B43L13/146
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Parent Industries

BPERFORMING OPERATIONS TRANSPORTING B43Writing accessories B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING B43L13/00Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for

Current Industry

B43L13/146Squares
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Variable perspective viewing device
    • Patent number 5,099,582
    • Issue date Mar 31, 1992
    • Hwang N. Chang
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    Orthographic to axonometric plotting apparatus
    • Patent number 4,166,321
    • Issue date Sep 4, 1979
    • Brian J. Monahan
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    3685156
    • Patent number 3,685,156
    • Issue date Aug 22, 1972
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    3157951
    • Patent number 3,157,951
    • Issue date Nov 24, 1964
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
  • Information Patent Grant

    2610407
    • Patent number 2,610,407
    • Issue date Sep 16, 1952
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES