letter of patent

• 专利证书

letter of patent的用法和样例：

例句

1. Even then,you will not get the patent certificate.
   即使在那时，你将拿不到专利证书。
2. The first English patent for a typewriter was issued in 1714.
   英国第一台打字机专利证书是一七一四年颁发的。