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天津电机总厂在1982年夏至1983年春,研制成功了一种A42型潜油泵的叶轮、导壳(以下简称A42型叶轮、导壳),并于1985年3月向中国专利局申请专利(申请号为85202072)。1986年10月15日中国专利局予以公告,1987年2月5日被正式授予实用新型专利权(专利证书第2640号)。1987年3月,该厂发现主要用户单位大庆油田对A42型叶轮、导壳需求量锐减,而销售市场上却出现了大批无锡叶片厂的仿
In the summer of 1982 to the spring of 1983, Tianjin Electrical Machinery Factory successfully developed a type A42 submersible pump impeller and guide shell (hereinafter referred to as A42 impeller and guide shell) and applied for a patent to China Patent Office in March 1985 No. 85202072). On October 15, 1986, the Chinese Patent Office made a public announcement, and on February 5, 1987, it was officially granted a patent for utility model (Patent No. 2640). March 1987, the plant found that the main user unit Daqing Oilfield on the A42-type impeller, guide the sharp drop in demand, while the sales market there have been a large number of imitation of Wuxi Blade Factory