US Patent 7017311 Panel for modular construction

The invention provides a panel for modular construction of partitions and walled structures, the panel having a top, a bottom, two major surfaces and two minor side surfaces, a first of the side surfaces being provided with a first profile and a second of the side surfaces being provided with a second profile, wherein the first profile and the second profile are provided with means for complementary engagement with a profile of an adjacently-positioned panel, and wherein each of the first profiles is provided with two inter-engagement means arranged at angle of about 90° to each other enabling the alternative inter-engagement of two adjacent panels with an angle of 180° therebetween, and at an angle of about 90° therebetween.