| Patents for B43L 13 - Drawing instruments, or writing or drawing appliances or accessories, not otherwise provided for (6,769) |
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| 10/17/1978 | US4121299 Constant velocity vector generator employing absolute value amplifier circuits |
| 10/03/1978 | US4117599 Apparatus for drafting inaccurate conic perspective |
| 10/03/1978 | US4117598 Drawing instrument or apparatus |
| 09/05/1978 | CA1037928A1 Instrument pen with integral pen arm attachment means |
| 08/15/1978 | US4106202 Apparatus for indicating the angle of a drafting parallel |
| 08/08/1978 | US4106031 Automatic drafting device |
| 07/25/1978 | US4102050 Cursor assembly |
| 07/25/1978 | US4102048 Device for correcting positional deviation and reduced scale of photograph |
| 07/11/1978 | US4099330 Vibratory drawing device |
| 06/27/1978 | US4097874 Blocking assembly for an automatic drafting device |
| 06/27/1978 | US4097142 Optical pattern tracer |
| 05/30/1978 | US4091980 Apparatus for advancing sheet material |
| 05/23/1978 | US4091393 Automatic pencil apparatus for an automated drafting system |
| 05/23/1978 | US4090301 Graphic recording system |
| 05/09/1978 | US4087916 Drawing table with a telescopic arm |
| 04/18/1978 | US4084329 Protractor-type hatching control device |
| 03/28/1978 | US4080742 Kit of parts for forming a curved member, and curved member formed thereby |
| 03/28/1978 | US4080738 Copying device for tailor's trade |
| 03/14/1978 | US4078312 Drafting parallel bar |
| 02/28/1978 | US4075762 Instrument for making perspective drawing |
| 02/21/1978 | US4074437 Drafting template |
| 02/21/1978 | US4074414 Process for the production of lettering or symbol templates |
| 01/31/1978 | US4070758 Straightedge supporting device for rail type drawing instrument |
| 01/24/1978 | US4069588 Digitizer |
| 01/17/1978 | US4068380 Device for dividing an angle |
| 01/10/1978 | US4067112 Cutting guide for custom mats |
| 12/13/1977 | US4062648 Plotter with adaptive velocity means for improving plotted line quality |
| 12/06/1977 | US4060901 Template for lining sheet music paper |
| 12/06/1977 | US4060900 Angle measuring device |
| 10/18/1977 | US4054883 Ink pen device |
| 10/18/1977 | US4053987 Multi-purpose drawing instrument |
| 09/27/1977 | US4051381 Device for the programmed tracing of designs by particle bombardment |
| 09/20/1977 | US4048725 Feed index device in universal parallel ruler or the like |
| 09/20/1977 | US4048724 Ellipsograph |
| 09/13/1977 | US4047304 Drafting board with adjustable straight-edge assembly |
| 06/28/1977 | US4032768 Constant velocity vector generator |
| 06/21/1977 | US4030200 Portable sewing aligning table system |
| 05/31/1977 | US4026644 Device for inscribing additional information on microfilms |
| 05/31/1977 | US4026041 Two-dimensional drawing board manikin |
| 05/31/1977 | US4026030 Drafting template |
| 04/26/1977 | US4019258 Device for attaching rollers to a carriage adapted to move along a rail |
| 04/26/1977 | US4019256 Guide for tool or instrument |
| 03/29/1977 | US4015269 Automatic pencil apparatus for an automated drafting system |
| 03/08/1977 | US4010547 Drafting machine |
| 02/22/1977 | US4008528 Drawing apparatus |
| 02/22/1977 | US4008522 Chalkboard line tool |
| 02/15/1977 | US4007542 Straightedge |
| 01/11/1977 | US4001941 Graphic reproduction apparatus |
| 12/14/1976 | US3996670 Protractor with digital readout |
| 11/02/1976 | US3988838 Artists device |
| 11/02/1976 | US3988834 Egg marker |
| 11/02/1976 | US3988833 Tracing scope |
| 10/05/1976 | US3984845 Projecting optical system for photodrawing machine |
| 09/28/1976 | US3983569 Instrument pen with integral pen arm attachment means |
| 09/07/1976 | US3978587 Drafting system and apparatus |
| 07/20/1976 | US3971036 Plotting head for consumable marking material |
| 04/20/1976 | US3950853 Track type drafting machine |
| 04/13/1976 | US3950762 Drawing method and drawing instrument |
| 04/13/1976 | US3950085 Optical transformation drawing apparatus |
| 04/06/1976 | US3947969 Drawing instruments |
| 03/23/1976 | US3945123 Device for drawing objects in perspective |
| 02/24/1976 | US3939588 Lettering guide apparatus |
| 02/24/1976 | US3939564 Adjustable grid line device |
| 02/17/1976 | US3939482 Writing apparatus |
| 02/10/1976 | US3936942 Optical pantograph |
| 02/03/1976 | US3936712 Interactive graphic system |
| 02/03/1976 | US3935641 Adjustable drawing sweep |
| 01/06/1976 | US3930314 Drafting machine |
| 01/06/1976 | US3930313 Drawing apparatus |