Bibliographic Data Application Number: 07/574,529 Customer Number: - Filing or 371 (c) Date: 08-28-1990 Status: Patented Case Application Type: Utility Status Date: 12-26-1990 Examiner Name: SIMONE, TIMOTHY F Location: ELECTRONIC Group Art Unit: 2402 Location Date: - Confirmation Number: 8452 Earliest Publication No: - Attorney Docket Number: 2397/78984/nhz Earliest Publication Date: - Class / Subclass: 099/411 Patent Number: 4,995,312 First Named Inventor: ERNEST LEIROS , DIJON, (FR) Issue Date of Patent: 02-26-1991 -------------------------------------------------------------------------------- Title of Invention: COOKING APPLIANCE WITH ELECTRIC HEATING 这是美专局提供的这个专利的法律状态 其中Status(法律状态)为Patented Case(专利已授权) 美国专利的有效期是20年,这个专利的申请日是1990年8月28日,应该从申请日算起,所以说这个专利已经过期, 应该没有续期,20年以前的技术了。