Resources Contact Us Home
Browse by Category: Main > Business
Class Information
Number: 434/214
Name: Education and demonstration > Mathematics > Geometry, trigonometry, or physical mathematic model structure > Property of circle or ellipse
Description: Subject matter relating to characteristics of a closed plane curve every point of which is equidistant from a fixed point within the curve, or characteristics of a closed plane curve generated about two points in such a way that the sums of its distances from two fixed points is a constant.

Patents under this class:

Patent Number Title Of Patent Date Issued
7802369 Method for designing structure by drawing curve approximately with circular segment, and structure thereby Sep. 28, 2010
7668337 Ellipsoid detecting method, figure center detecting method, image recognizing device, and controller based on image Feb. 23, 2010
7174645 Method for designing of aproximate elliptical structure and the same Feb. 13, 2007
7025593 Teaching circumference instrument Apr. 11, 2006
6702582 Device and method for solving circles Mar. 9, 2004
6213779 Conic section activity boards Apr. 10, 2001
6132217 Method and apparatus for teaching relationship of trigonometric functions between unit circle and rectangular coordinate system Oct. 17, 2000
5470234 Circular, piece-matching math educational aid Nov. 28, 1995
5407356 Pictorial image transforming manipulative-with multiple channel tracks Apr. 18, 1995
5281145 Pictorial image transforming manipulatives Jan. 25, 1994
5215467 Mathematical instruction board and method of use Jun. 1, 1993
5114347 Mathematical function demonstrator boards May. 19, 1992

  Recently Added Patents
Field device configuration system
System and methods for obstacle mapping and navigation
Base station apparatus and method for use in mobile communication system
Automated user interface adjustment
Content distribution system, mobile communication terminal device, and computer readable medium
User control of replacement television advertisements inserted by a smart television
Presenting a link to a user
  Randomly Featured Patents
Long term drug delivery devices with polyurethane based polymers and their manufacture
2-(4-bromo or 4-iodo phenylamino) benzoic acid derivatives
Unwinding machine
Agent for treating illnesses of the tracheobronchial tract, especially chronic obstructive pulmonary disease (COPD)
Implicit certificate scheme
Method and apparatus for cleaning with high pressure liquid at low flow rates
Method for autonomous dynamic voltage and frequency scaling of microprocessors
Immunotoxin with in vivo T cell suppressant activity and methods of use
Paging processing system in virtual storage device and paging processing method thereof
Tire holding device and use thereof