Optical system of straight-tube telescope and its straight-tube telescope with ultralarge visual field

Application Number: 00114170Application Date: 2000.03.30Publication Number: 1315666Publication Date: 2001.10.03Priority Information: International: G02B23/02Applicant(s) Name: Rirong Plastic Electronic Products Co Ltd, ZhongshanAddress: Inventor(s) Name: Wen Baoquan;Lei WeijiaPatent Agency Code: 44211Patent Agent: yin wentaoAbstract An optical system for straight-tube telescope is composed of object lens, Behan prism and eyelens. Said Behan prism including two prisms is arranged between Read more

Ventilation device for rise straight-tube of vacuum water drainage system

Application Number: 00127084Application Date: 2000.09.16Publication Number: 1288990Publication Date: 2001.03.28Priority Information: 1999/9/16 US 09/397230International: E03C1/122;E03F1/00;E03F3/00Applicant(s) Name: Evark International Co., Ltd.Address: Inventor(s) Name: B. Phonparphy;D.M. Varass;J.D. StradingerPatent Agency Code: 72001Patent Agent: zhang shegaoAbstract A vacuum drainage system (12) having a vertical riser (16) with an aeration point (10,30). The aeration point prevents stalls in the vacuum drainage Read more