U.S. Patent Office

Chicago citation style
U.S. Patent Office. no date. Retrieved from the Digital Public Library of America, http://contentdm.acpl.lib.in.us/cdm/ref/collection/p15155coll1/id/1543. (Accessed June 19, 2018.)
APA citation style
(no date) U.S. Patent Office. Retrieved from the Digital Public Library of America, http://contentdm.acpl.lib.in.us/cdm/ref/collection/p15155coll1/id/1543
MLA citation style
Retrieved from the Digital Public Library of America <http://contentdm.acpl.lib.in.us/cdm/ref/collection/p15155coll1/id/1543>.
Note: These citations are programmatically generated and may be incomplete.