| Patents for B43L 11 - Non-circular-curve-drawing instruments (856) |
|---|
| 07/21/1993 | CN2138576Y Instrument for drawing ellipses |
| 07/07/1993 | CN2137600Y Simple ellipsograph with three foot |
| 06/16/1993 | CN2136147Y Arbitrary ellipsograph |
| 06/16/1993 | CN2136146Y Adjustable spline for drawing curve |
| 06/16/1993 | CN1073138A Elliptical drawing instrument |
| 05/05/1993 | CN2131709Y Simple ellipsograph |
| 05/05/1993 | CN1071623A Ellipsograph |
| 04/28/1993 | CN2130705Y Drawing ellipsograph |
| 03/02/1993 | US5189800 Device for drawing elliptical curves |
| 02/10/1993 | CN2126828Y 标准椭圆规 Standard gauge oval |
| 02/04/1993 | DE4125681A1 Compasses to draw circles, squares, polygonal figures - has multi-functional segmented constructed calipers, with switchable cam tracing mechanism |
| 01/06/1993 | CN1067617A 椭圆规结构 Regulation oval structure |
| 11/25/1992 | CN2122739U Compass able to be used as ellipsograph |
| 11/18/1992 | CN2122068U Elliptic compasses |
| 10/28/1992 | CN2120035U Universal ellipsograph |
| 10/14/1992 | CN2118641U Compass for drawing ellipses |
| 09/16/1992 | CN2115902U Standard double-use curve gauge for drawing circle and ellipse |
| 09/09/1992 | CN2115228U Sucker type elliptic trammel |
| 09/09/1992 | CN2115227U Hyperbola instument |
| 08/19/1992 | CN2113171U Ellipsograph |
| 08/12/1992 | CN2112517U Dual-purpose compasses for ellipse and curve of teaching |
| 08/05/1992 | CN2111854U Ellipse, circular and hyperbola mapper |
| 08/04/1992 | US5134778 Design-making instrument |
| 07/29/1992 | CN2111202U Universal curve compasses |
| 06/23/1992 | US5123171 Irregular surface ellipsograph |
| 06/23/1992 | US5123170 Ellipsograph as a drafting tool |
| 06/17/1992 | CN2107387U Parabola gauge |
| 06/10/1992 | CN2106727U Multi-functional drawing instrument |
| 06/10/1992 | CN2106726U Ellipses drawing instrument |
| 05/13/1992 | CN1016592B Eiliptic curve plotting method and its plotter |
| 04/15/1992 | CN1016242B Ellipsograph |
| 04/08/1992 | CN2100988U Ellipse gauge |
| 04/01/1992 | CN1016093B Series arc length gauge |
| 03/11/1992 | CN2098389U Ellipsograph |
| 02/26/1992 | CN2097101U Ellipsograph |
| 02/26/1992 | CN2097100U Ellipsograph for classroom teaching |
| 02/12/1992 | CN2095777U Compasses capable of drawing ellipse |
| 01/29/1992 | CN2094459U Straight rule shape focus adjusting elliptic compasses |
| 01/15/1992 | CN2093101U Three-purpose ellipsograph for teaching |
| 01/08/1992 | CN2092443U Conic curve gauge |
| 12/12/1991 | DE4018537A1 Recording device for gear wheel profile - has stepped flame with different base circles, rule moving round circles and displaced on table, needle tracing profiles on screen |
| 12/11/1991 | CN2090331U Multifunction ellipsograph |
| 12/04/1991 | CN2089878U Ellipse compasses |
| 12/04/1991 | CN2089877U Curve ruler with compasses board position |
| 11/27/1991 | CN2089414U Curve drawing device by magnetic force |
| 11/19/1991 | US5065523 Structure of isometric ellipse scale |
| 11/13/1991 | CN2088487U Conical curve gauge |
| 11/06/1991 | CN2088047U Multi-purpose curve-drawing instrument |
| 10/22/1991 | US5058282 Ellipsograph |
| 10/16/1991 | CN2086669U Ellipse template |
| 10/15/1991 | US5056230 Ellipsograph structure |
| 09/25/1991 | CN1054826A Multifunctional pen for plotting curves |
| 08/29/1991 | DE4029064A1 Drawing appts. producing parabola - involves right-angled rods rotatably fitted in two vertices so that their shanks form two points of intersection |
| 08/21/1991 | CN2083117U Universal gauge of conical section |
| 08/21/1991 | CN2083116U Parabola drawing instrument |
| 07/31/1991 | CN2081808U Seat-type ellipse-drawing instrument |
| 07/31/1991 | CN2081807U Multifunction mapping apparatus |
| 07/17/1991 | CN2080910U Multipurpose ellipsograph |
| 07/17/1991 | CN2080909U 椭圆规 Oval regulation |
| 07/10/1991 | CN2080468U Ellipsograph |
| 06/12/1991 | CN2078695U Double-centring ellipsograph |
| 05/29/1991 | CN2077802U Curve drawing instrument |
| 05/29/1991 | CN2077801U Conic section drawing instrument |
| 05/22/1991 | CN2077379U Elliptic trammel |
| 05/15/1991 | CN2076923U Ellipse combined rule |
| 04/17/1991 | CN2075147U Multipurpose ellipse plotter |
| 04/03/1991 | CN2074245U 椭圆规 Oval regulation |
| 03/27/1991 | CN2073821U 椭圆规 Oval regulation |
| 03/13/1991 | CN2072914U Ellipsographer |
| 02/20/1991 | CN2071590U Circular drawing instrument for curved surface |
| 02/06/1991 | CN2070680U Ellipsograph |
| 02/06/1991 | CN2070679U Multifunctional gauge |
| 01/30/1991 | CN2070250U Simple ellipse drawing instrument |
| 01/23/1991 | CN2069791U Conicograph |
| 01/09/1991 | CN1048356A Ellipsograph |
| 12/26/1990 | CN2068055U Multi-purpose compasses |
| 12/05/1990 | CN2066810U Ellipse compasses |
| 11/28/1990 | CN2066390U Multipurpose drawing compasses |
| 11/21/1990 | CN2065988U 椭圆规 Oval regulation |
| 11/21/1990 | CN2065987U 万能曲线仪 Universal profiler |
| 11/20/1990 | US4970792 Drawing machine |
| 11/14/1990 | CN2065564U Multifunctional curve drawing instrument |
| 11/14/1990 | CN2065563U Compass for circular curve or ellipse |
| 09/19/1990 | CN2062285U Scriber for cylinder relative line |
| 08/07/1990 | US4945643 Amusement apparatus for drawing a distorted caricature by tracing an original photograph or the like |
| 06/13/1990 | CN1042870A Three-legged two-purpose ellipsograph |
| 06/06/1990 | CN2057894U Hyperbolic curve gauge |
| 05/29/1990 | US4928625 Pendulum mounted airbrush |
| 05/23/1990 | CN1042330A Conical section gauge |
| 04/11/1990 | CN2055777U Drawing instrument for drawing conic section |
| 02/14/1990 | CN2052724U Table type multipurpose combination compass |
| 01/31/1990 | CN2051896U Multi-purpose drawing instrument |
| 01/24/1990 | CN2051572U Ellipsograph for teaching |
| 01/17/1990 | CN2051162U Parabolic and hyperbolic dual purpose compasses |
| 01/17/1990 | CN1038792A Multifunctional ellipsograph |
| 12/27/1989 | CN2050010U Ellipse mapper |
| 12/13/1989 | CN2049188U Drawing tool for drawing axonometric ellipse |
| 11/29/1989 | CN2048429U Ellipse compass for teaching |
| 11/01/1989 | CN2046814U Multifunction compasses |
| 10/04/1989 | CN2045358U Multipurpose drawing instrument capable of drawing ellipse |