Isidor Joseph Hinsperger b. 12/04/1880 d. 03/02/1959 in Ventura County, CA.
(wife?) Margaret O. Hinsperger b. 09/25/1884 b. Illinois d. 01/02/1971 in Ventura County, CA.
(taken from the California Death Index searchable database).
Suggest you go to the Cal Birth Index at: http://userdb.rootsweb.com/ca/birth/search.cgihttp://userdb.rootsweb.com/ca/birth/search.cgi and search the two spellings you wrote.There were lots of full names, birth dates, etc for your surname b. in California after 1905.
If you write a letter to the Ventura County Public Library you can probably get his obituary, which should list living family members, locations, etc, at the time of his death.
Best of luck to you.
PS. the death index is found at the same www site address, just replace "birth" with "death" and you can search deaths in California 1940-1970ish.