“专利证”用英语怎么说

兹许可这些法人和公司在专利证(的规定范围)下生产各种特许设备.Those persons and firms are licensed to produce licensed devices under patent.已经存在的专利证成千上万?There are hundreds of thousands of patents in existence?现在专利证还在他东家手里呢.His master holds the patent ...