| Patents for B43L 11 - Non-circular-curve-drawing instruments (856) |
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| 09/18/2002 | CN1091039C Multipurpose geometric curve gauge |
| 09/11/2002 | CN2510310Y Real motion orbit structure for related celestial bodies |
| 08/14/2002 | CN2505297Y Compasses and ellipsograph |
| 07/17/2002 | CN2500496Y Elliptic diagraph |
| 07/17/2002 | CN2500495Y Imaginary and real axis conical curve line diagraph |
| 07/17/2002 | CN2500494Y Parabolic diagraph |
| 07/17/2002 | CN2500493Y Hyperbolic curve line diagraph |
| 06/26/2002 | CN2496671Y Elliptic-circular two-purpose compasses |
| 05/29/2002 | CN2493427Y Ellipse compasses |
| 04/23/2002 | US6374503 Oval cutter |
| 04/17/2002 | CN2486347Y Elliptical instrument |
| 03/27/2002 | CN2483200Y Compass for drawing ellipses |
| 03/13/2002 | CN2481530Y Ellipsograph |
| 03/13/2002 | CN2481529Y Universal instrument for drawing ellipses |
| 02/20/2002 | CN2477397Y Elliposgraph |
| 02/06/2002 | CN2475570Y Ellipsograph |
| 01/23/2002 | CN2472965Y Ellipsograph |
| 01/16/2002 | CN2471556Y Two-purpose compasses |
| 01/16/2002 | CN2471555Y Multifunctional ellipse compasses |
| 01/02/2002 | CN2468759Y Constant speed compass for drawing spirals |
| 01/02/2002 | CN2468758Y Compass for drawing ellipses |
| 12/26/2001 | CN2467331Y Two-leg ellipsograph |
| 11/28/2001 | CN2461779Y Pascal scroll wire gauge |
| 10/30/2001 | US6308426 Ellipsograph |
| 10/18/2001 | US20010029679 Curve creator and duplicator |
| 09/26/2001 | CN2449938Y 椭圆规 Oval regulation |
| 09/19/2001 | CN2448573Y Device for drawing ellipse |
| 08/29/2001 | CN1070123C Setting method of focus curve gauge and its apparatus |
| 08/22/2001 | CN2443855Y 椭圆规 Oval regulation |
| 08/21/2001 | US6276067 Ellipse drawing/cutting device |
| 08/15/2001 | CN2442848Y 多功能圆规 Multifunction Compass |
| 08/08/2001 | CN2441652Y 椭圆规 Oval regulation |
| 08/01/2001 | CN2440669Y Twin curves drawing instrument |
| 08/01/2001 | CN2440668Y Secondary curves instrument |
| 07/11/2001 | CN2438591Y Ellipsoid drawing instrument |
| 07/11/2001 | CN2438590Y Pare-curve drawing instrument |
| 07/11/2001 | CN2438589Y Double-curve drawing box |
| 06/27/2001 | CN2436327Y Ellipse instrument |
| 06/27/2001 | CN2436326Y Compasses capable of drawing ellipse |
| 05/23/2001 | CN2431121Y Pare-curve drawing instrument |
| 03/14/2001 | CN2423113Y Ellipsograph |
| 12/27/2000 | CN2411902Y 一种椭圆规 An Elliptical regulation |
| 12/12/2000 | US6158133 Oval cutter |
| 11/22/2000 | CN1273914A Elliptic compasses |
| 07/12/2000 | CN2387052Y Improved adhesion agent vessel cover |
| 07/06/2000 | WO2000038934A1 Oval cutter |
| 07/06/2000 | CA2356248A1 Oval cutter |
| 06/21/2000 | CN2383699Y Plane-type ellipsograph |
| 05/31/2000 | CN2380404Y Ellipsograph |
| 04/26/2000 | CN2376026Y Multi-purpose curve gauge |
| 04/05/2000 | CN2372150Y 一种椭圆规 An Elliptical regulation |
| 02/23/2000 | CN2365078Y Geometric gauge |
| 12/22/1999 | CN2354772Y Elliptic instrument |
| 12/01/1999 | CN2351298Y Correction fluid & correction tape combined stationery |
| 11/17/1999 | CN2349030Y Camber compasses |
| 10/27/1999 | CN2345367Y Shell for filling solid glue |
| 08/18/1999 | CN2333551Y Curvometer for trisection angle and its equation |
| 08/10/1999 | US5933970 Powered toy hand drawing device |
| 07/14/1999 | CN2328526Y Curve compass |
| 07/14/1999 | CN1222454A Combined conic-section plotter |
| 07/07/1999 | CN2327651Y Discharging structure of storing container of thermal glue machine |
| 07/06/1999 | US5918373 Design drawing device |
| 06/30/1999 | CN2326452Y Multifunctic compasses |
| 06/30/1999 | CN2326451Y Elliptic compasses |
| 06/02/1999 | CN2321632Y Parabola drawing instrument |
| 05/26/1999 | CN2320427Y Multi-functional drawing instrument |
| 05/12/1999 | CN2318049Y 椭圆规 Oval regulation |
| 05/12/1999 | CN2318048Y Convenient glue box |
| 05/05/1999 | CN2317096Y Curve ruler for drawing para-curve |
| 03/17/1999 | CN2310683Y Ellipse gauge |
| 03/17/1999 | CN2310682Y Para-curve gauge |
| 03/17/1999 | CN2310681Y Hyperbolic curve gauge |
| 03/10/1999 | CN1210079A Method and device for setting focus curve instrument |
| 03/03/1999 | CN2309237Y Multi-functional elliptic compasses |
| 03/03/1999 | CN2309236Y Compasses for drawing ellipses |
| 03/03/1999 | CN1209394A Ellipse drawing instrument |
| 02/16/1999 | US5870830 Hand-held drawing device |
| 01/27/1999 | CN2305296Y Secondary curve drawing instrument |
| 01/13/1999 | CN2303733Y 一种椭圆规 An Elliptical regulation |
| 12/30/1998 | CN2302136Y A-line instrument for drawing spirals |
| 12/30/1998 | CN2302135Y Three-purpose drawing instrument |
| 12/16/1998 | CN2300523Y Correcting device capable of quick drying correction fluid |
| 11/18/1998 | CN2297323Y Curve-drawing instrument for drawing conic section |
| 11/11/1998 | CN2296826Y Gauge for drawing intersecting line |
| 10/28/1998 | CN2295609Y Involute measuring and drawing instrument |
| 10/07/1998 | CN2293459Y Conic gauge |
| 10/07/1998 | CN2293458Y Device for opening envelope |
| 10/07/1998 | CN1194915A Multipurpose geometric curve gauge |
| 09/30/1998 | CN2292683Y Cycloid drawing instrument |
| 09/23/1998 | CN2292030Y Ellipse compass |
| 09/09/1998 | CN2290482Y Circular functions drawing device |
| 08/19/1998 | CN2288083Y Universal drawing instrument for drawing arbitrary ellipses |
| 08/19/1998 | CN2288082Y 一种椭圆规 An Elliptical regulation |
| 05/19/1998 | US5752870 Line-drawing toy |
| 04/22/1998 | CN1179388A Quick-quantitative ellipse drawing method |
| 01/29/1998 | DE19635333A1 Equipment for drawing and making conical sections |
| 01/28/1998 | CN2273255Y Multifunction spline |
| 01/20/1998 | US5709033 Drawing device |
| 01/14/1998 | CN2272374Y Ellipse compasses |
| 01/07/1998 | CN2271968Y Compasses for drawing ellipses |