Google actually have a special search engine for US patents at https://www.google.co.uk/advanced_patent_search but it doesn't seem to have much luck finding this one.
A bit of fiddling reveals that each patent has a URL based on it's number though, and I believe https://www.google.co.uk/patents/US804529 is what you're looking for:
Be it known that I Minna B. Foster, a citizen of the United States,
residing at Sausalito, in the county of Marin and State of California,
have invented new and useful Improvements in Stock-Supporters, of
which the following is a specification.
My invention relates to a device which is especially designed for
supporting stocks of soft material, such as are used by ladies for
neckwear.
and so on...
A PDF of the original can be downloaded.