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)
09/1987
09/02/1987CN86206151U "t square" (used without the help of drawing board)
08/1987
08/26/1987CN86200922U Combination ruler
08/19/1987CN86206766U Adjustable t-square for mapping
08/19/1987CN86201500U Set square with vernier
08/12/1987CN86203130U Teaching and drawing angle square
08/05/1987CN86206475U Set square with compass and protractor
08/05/1987CN86205426U Universal carpenter's square drawing lines
07/1987
07/29/1987CN85205342U Universal carpenter's ruler
07/22/1987CN86207010U Miniature t-square
07/22/1987CN86204017U Drawing straightedge with relief rib
07/15/1987CN86209319U Multifunctional template ruler
07/08/1987CN86206219U Two-purpose ruler being able to draw circle or straightline
06/1987
06/24/1987EP0226102A2 Drawing rule with raising slider
06/24/1987CN86207752U Proportional ruler
06/23/1987US4674192 Accounting guide
06/17/1987CN86205160U Vernier caliper with the function of protractor for students
06/03/1987EP0224376A2 Drawing instrument
06/02/1987US4669197 Drawing aid
05/1987
05/27/1987CN86204981U Universal ruler
05/20/1987CN86206443U Universal set square
05/19/1987US4665623 Illuminated drafting aid
05/13/1987CN86204874U Hatch line ruler
05/13/1987CN86201323U Universal t ruler
04/1987
04/30/1987DE3607919C1 Rotating tip apparatus for drawing instruments
04/28/1987US4660292 Combination measuring device, level and plumb
04/07/1987US4654976 Ruler belt hanger
03/1987
03/31/1987US4653194 Composite-type ruler
03/04/1987CN86204988U Translational multipurpose charting straightedge
02/1987
02/26/1987DE3529469A1 Drawing device
02/24/1987US4644663 Measuring device
02/18/1987CN85106460A Multipurpose ruler for drafting and calculating
02/11/1987CN86202473U Multipurpose triangular ruler
02/11/1987CN86100727A Arithemetic ruler for primary school
02/10/1987US4641436 Ruler
01/1987
01/29/1987WO1987000668A1 Educational visual aid particularly for demonstration in solid geometry
01/28/1987CN85204750U Multifunction implement for measuring and drawing t
01/27/1987US4638569 Business form design aid
01/22/1987EP0163640A4 Guide or marking tool.
01/06/1987US4633592 Precision rule
01/06/1987US4633591 Digital image proportion analyzer
12/1986
12/02/1986US4625425 Universal triangle
10/1986
10/29/1986CN85205623U 万能比例尺 Universal scale
09/1986
09/24/1986EP0195183A1 Ruler for measuring angles between an oriented axis and a vector
09/24/1986CN85202736U Rulers with writing appliances
09/17/1986CN86202469U Multifunctional straightedge
09/16/1986US4611407 Pivot assembly
08/1986
08/28/1986WO1986004861A1 Ruler
08/20/1986CN85204360U Multi-functional t-square
08/13/1986EP0190445A1 Drafting head
08/13/1986EP0190339A1 Drawing instrument
08/13/1986CN85203515U Multifunction ruler for middle school students
07/1986
07/30/1986EP0188505A1 Combined ruler protractor
07/30/1986CN85203682U Multipurpose scale
07/22/1986US4601108 Spacer device
07/16/1986CN85204359U Multifunction t-aquare
07/15/1986US4599805 Transmutable rule
07/02/1986EP0186082A1 Writing underlay
06/1986
06/25/1986CN85203581U Drawing and calculating multipurpose ruler
05/1986
05/27/1986CA1204930A1 Combination layout tool and square
05/06/1986US4586265 Perspective drawing apparatus
04/1986
04/30/1986CN85203137U Portable t square
04/30/1986CN85203006U Ruler for section line
04/29/1986US4584779 Trimming square set
03/1986
03/25/1986US4577415 Windowed indexed calibrated T-square and precision-lined drafting board having linear edges
03/11/1986US4574492 Combination layout tool and square
03/05/1986EP0173354A1 Drafting apparatus
02/1986
02/27/1986WO1986001159A1 Drawing instrument
01/1986
01/30/1986WO1986000578A1 Combined ruler protractor
01/22/1986EP0168948A1 Parallel rulers
01/21/1986US4565016 Perspective drafting instrument
01/21/1986US4565012 Marking and measuring instrument
12/1985
12/18/1985EP0164542A1 Straight edge
12/11/1985EP0163640A1 Guide or marking tool
11/1985
11/26/1985US4554746 Self-locking-and-measuring ruler for computer-printout forms
11/12/1985US4551923 Drawing triangle
11/06/1985EP0160101A1 Ruler for trimming
10/1985
10/08/1985US4545130 Designer's triangle
07/1985
07/30/1985US4531303 For use in orientation of lines
07/30/1985US4531302 Replacement edge drafting apparatus
07/02/1985US4525933 Adjustable T-square
05/1985
05/14/1985US4516800 Device for picking up and handling drafting templates, triangles and the like
05/09/1985WO1985001918A1 Ruler for trimming
05/08/1985EP0139678A1 A combination layout tool and square
05/02/1985EP0139198A1 Ruler
05/02/1985EP0138936A1 Drawing aid.
04/1985
04/30/1985US4513510 Measuring tool
04/02/1985US4507869 Marker attachment for rules
03/1985
03/26/1985US4506451 Multi-functional square and angle marking tool having extendable stops
01/1985
01/29/1985US4495709 To a triangular ruler
01/01/1985US4490921 Drafting tool
10/1984
10/11/1984WO1984003863A1 Drawing aid
10/03/1984EP0120101A1 Back square
08/1984
08/30/1984WO1984003259A1 A combination layout tool and square
08/28/1984US4467528 Parallel ruler
07/1984
07/31/1984US4462168 Variable angle straight edge
07/24/1984US4461092 Set square
07/19/1984WO1984002754A1 A pivot assembly
06/1984
06/26/1984US4455760 Triangle
06/26/1984US4455750 Drafting tool for parallel lines
06/05/1984US4451993 Sliding rule and protractor
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