Patents
Sitemap › B43 - Writing or drawing implements; Bureau accessories › B43L - Articles for writing or drawing upon; Accessories for writing or drawing › B43L 7 - Straightedges
Patents for B43L 7 - Straightedges (3,964)
07/1991
07/10/1991CN2080470U Multifunction triangle ruler
07/02/1991CA1285385C Straightedge
07/02/1991CA1285384C Draughting tables, drawing boards, drawing instruments and analogous apparatus
06/1991
06/26/1991CN2079569U Lined multipurpose scale
06/26/1991CN2079566U Wheel ruler with drawing tooth
06/19/1991CN2079123U Three purpose rule for student
06/19/1991CN2079122U Drawing rule
06/19/1991CN2079121U Multifunctional maths ruler
06/19/1991CN2079120U Rolling multi-purpose rule and pen
06/05/1991CN2078236U Multipurpose drawing instrument for drawing a plane
06/04/1991US5020233 Measuring instrument
05/1991
05/15/1991CN2076926U Parallel multiple-surface rule
05/08/1991CN2076498U Arbitrary-angle board with angle nonius
05/08/1991CN2076494U Flexible slice scale
05/01/1991CN2076034U Equidistant ruler
04/1991
04/24/1991CN2075597U Any angle drawing straight rule
04/24/1991CN1050848A Drawing rule additional unit
04/17/1991EP0422334A1 Scientific ruler
04/16/1991US5007174 Having different distant scales
04/11/1991DE4022455A1 Measuring arrangement for length or height and width ratios - has relatively movable scanned parts for opening or closing viewing windows e.g. as drawing aid
04/10/1991CN2074712U Multi-purpose rule
04/09/1991CA1282587C Drafting device
04/03/1991EP0419588A1 Instrument for measuring angles and plotting with direct angle display and/or corresponding trigonometric values
04/03/1991CN2074246U Multi-functional drawing ruler
04/03/1991CN2074244U Structure-improved multi-function ruler
04/03/1991CN2074243U Scale
04/03/1991CN2074242U Multi-purpose gauge
04/03/1991CN2074241U Multi-functional drawing ruler
03/1991
03/20/1991CN2073368U Sleeve of set square
03/19/1991US4999922 Ruled multi-purpose drafting instrument
03/13/1991CN2072913U Reset for draughting instrument
03/06/1991CN2072482U Multi-functional t-square
03/05/1991CA1280886C Ruler for measuring angles between an oriented axis and a vector
02/1991
02/27/1991CN2072027U Copying ruler for writing exercise
02/13/1991CN2071132U Drawing rule
02/06/1991CN2070678U Disposable ball pen
02/05/1991US4989332 Measuring apparatus
01/1991
01/30/1991CN2070251U Multi-purpose rule for maths
01/29/1991US4987685 Foldable accounting guide
01/09/1991EP0295267B1 Magnetically oriented draughting instrument
12/1990
12/12/1990CN1047649A Insert rular
12/04/1990US4974330 Angle drafting set
11/1990
11/21/1990CN2065989U Multi-purpose halving rule
11/14/1990CN2065568U Arbitrary rolling set square
11/14/1990CN2065566U Protractor and set square, ruler made by using protractor
10/1990
10/31/1990CN2064716U Multifunctional convenient ruler with reference system
10/03/1990CN2063221U Multifunction ruler
09/1990
09/18/1990US4956919 Drywall T-square
08/1990
08/29/1990CN2061127U Multifunctional drawing rule
08/29/1990CN2061126U Prism multi-proportional number scale
08/28/1990US4951397 Parking scale
08/22/1990CN2060734U Multi-purpose drawing aids
08/15/1990CN2060400U 绘图板 Drawing board
08/15/1990CN2060397U Multipurpose rule for student
08/08/1990CN1044432A Sizing gauge
08/01/1990CN1044260A Protracting-drawing device and set square and straight ruler made therefrom
07/1990
07/31/1990US4944095 Guiding device for a computer mouse
07/25/1990WO1990008938A1 Instrument for measuring angles and plotting with direct angle display and/or corresponding trigonometric values
07/25/1990CA2025891A1 Angle measuring device and marquing out instrument with direct display of angle and/or corresponding trigonometric data
07/10/1990US4940350 Fluid ball applicator with vent tube
06/1990
06/19/1990US4934061 Draughting tables, drawing boards, drawing instruments and analogous apparatus
05/1990
05/30/1990CN2057620U Multi-purpose drafting gauge
05/22/1990US4926564 Triangular drafting instrument
05/08/1990US4922621 For replicating angles in construction
05/01/1990US4920658 Collapsable framing square
04/1990
04/17/1990US4916827 Guide device for making entries in trucker's log book
04/10/1990US4914824 Parallel rule
04/05/1990WO1990003278A1 Drawing instrument
04/04/1990CN1040954A Model wc-1 multifunctional drawing ruler
03/1990
03/28/1990CN2055096U Multi-function drawing ruler
03/14/1990CN2054403U Drafting angle ruler
03/07/1990CN2053988U F shaped changeable ruler and its mating drawing-board
03/07/1990CN2053986U Multipurpose ruler for students
02/1990
02/21/1990CN2053150U Multipurpose teaching rule
02/13/1990CA1265673A1 Drawing instrument
02/07/1990CN2052356U Multipurpose rule
01/1990
01/31/1990EP0138936B1 Drawing aid
01/31/1990CN2051897U Multi-purpose straight-line drawing appliance
01/31/1990CN2051895U Multifunctional roller parallel ruler
01/24/1990EP0351942A1 Measuring apparatus
01/24/1990CN2051570U Multipurpose speed drawing ruler
01/10/1990CN2050801U Scale with proportion rod
01/03/1990CN2050383U 三棱笔盒 Triangular pencil cases
12/1989
12/20/1989CN2049603U Universal straightedge
12/13/1989EP0346110A1 Multi-directional type parallel rule
12/06/1989CN2048823U Simple multipurpose rule
12/06/1989CN2048822U Multifunctional coupled rule of arbitrary angles
11/1989
11/16/1989WO1989010848A1 Rolling ruler
11/01/1989CN2046813U 比例尺 Scale
11/01/1989CN2046812U Proportion ruler
10/1989
10/11/1989CN2045700U Proportion square ruler
10/05/1989WO1989009139A1 Drafting device
09/1989
09/13/1989CN2044211U Multi-functional moveable scale
08/1989
08/23/1989CN2043189U Moving multiedge scale
08/22/1989US4858807 Trace cutter for roll material
08/16/1989CN2042799U Equidistance parallel line plate
08/09/1989CN2042415U Multi-purpose quick-drafting drawing board for students
08/08/1989US4854049 Magnetic cropper
08/02/1989CN2042020U Segment divider
08/02/1989CN2042019U Multipurpose drawing rule
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