CIPO's Canadian Patent Database let you access 93 years of patent descriptions and images. You can search, retrieve and study more than 2,140,000 patent documents.
U.S. patents, 1790 to present and published applications, 2001 to present. Patents prior to 1976 can be retrieved by number, date and classification. TIFF viewer required to view/print patent documents.
Espacenet offers free access to more than 80 million patent documents worldwide, containing information about inventions and technical developments from 1836 to today.
PATENTSCOPE provides access to over 30 million patent documents including 2.2 million published international patent applications (PCT). Detailed coverage information can be found here
Full-text of over ten million patent documents from US, Europe, Australia and WIPO, their status and counterparts up to 70 countries.
SciFinder is a key database for chemistry, chemical and biochemical engineering, environmental sciences, materials science, and geochemistry. Its coverage includes journal articles, conference papers and patents from many patent issuing organizations. You can search by research topic, chemical substance, structure and substructure.
Over 24.4 million Patent records from the following five patent offices are available via Scopus: World Intellectual Property Organization (WIPO), European Patent Office, US Patent Office, Japanese Patent Office and UK Intellectual Property Office.
Google Patents is a search engine from Google that indexes patents and patent applications from the United States Patent and Trademark Office (USPTO), European Patent Office (EPO), and World Intellectual Property Organization (WIPO). These documents include the entire collection of granted patents and published patent applications from each database.
Provides fast, easy-to-use and free access to millions of patents and patent applications. US, European, Japanese and World patent documents from 1974 to present.
Citing Patent Literature
Smith, I. M. (1988). U.S. Patent No. 123,445. Washington, DC: U.S. Patent and Trademark Office
U.S. Patent No. 123,445 (1988)
(U.S. Patent No. 123,445, 1998)
 J. K. Author, “Title of patent,” U.S. Patent x xxx xxx, Abbrev. Month, day, year.
 J. P. Wilkinson, “Nonlinear resonant circuit devices,” U.S. Patent 3 624 125, July 16, 1990.
NOTE: Use “issued date” if several dates are given.
Sheem, S. K. Low-Cost Fiber Optic Pressure Sensor. U.S. Patent 6,738,537, May 18, 2004.
Petrovick, P. R.; Carlini, E. Antiulcerogenic Preparation from Maytenus ilicifolia
and Obtaintion Process. Br. Patent PI 994502, March 6, 1999.
Langhals, H.; Wetzel, F. Perylene Pigments with Metallic Effects. Ger. Offen. DE
10357978.8, Dec 11, 2003; Chem. Abstr. 2005, 143, 134834.
Shimizu, Y.; Kajiyama, H. (Kanebo, Ltd., Japan; Kanebo Synthetic Fibers, Ltd.).
Jpn. Kokai Tokkyo Koho JP 2004176197 A2 20040624, 2004.
Names, Creator. Patent title. Patent number, and year of filing.
Iizuka, Masanori, and Hideki Tanaka. Cement admixture. US Patent 4,586,960, filed June 26, 1984, and issued May 6, 1986.
This style manual does not specifically mention how to cite a patent; however, it can be extrapolated based on the typical MLA style for other types of materials.
Last Name, First Name. "Patent name." Patent XXX. Date.
(The date must be in Day Month Year format.)
Saunders, Terry. "Scraper plane." CA Patent 2,477,363. 10 August 2004.
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