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Dzus fastener, from US Patent 1955740.png 491 × 737; 111 KB Electrovoice-constant-directivity-horn-1975.jpg 672 × 537; 42 KB Ellipsoid Patent.jpg 383 × 329; 86 KB
LLP, Ladas & Parry. "A Brief History of the Patent Law of the United States". New York, 1999. Web Page. . Muir, Ian, Matthias Brandi-Dohrn, and Stephan Gruber. European Patent Law : Law and Procedure under the Epc and Pct. Oxford; New York: Oxford University Press, 1999. Robert B. Matchette et al. "Records of the Patent and Trademark Office".
The X generally appears at the end of the numbers hand-written on full-page patent images; however, in patent collections and for search purposes, the X is considered to be the patent type – analogous to the "D" of design patents – and appears at the beginning of the number.
Patent applications can be filed at the United States Patent and Trademark Office (USPTO). Prior to June 7, 1995, the duration of a US utility patent was 17 years from patent issuance. Since that date, the duration of the US utility patent is 20 years from the earliest effective filing date.
Usage on de.wikipedia.org United States Patent and Trademark Office; Usage on es.wikipedia.org Oficina de Patentes y Marcas Registradas de los Estados Unidos; Usage on fa.wikipedia.org اداره ثبت اختراع و نشان تجاری ایالات متحده آمریکا; Usage on fr.wikipedia.org United States Patent and Trademark Office
If your browser has difficulty displaying or downloading TIFF images, consider installing a TIFF capable extension such as AlternaTIFF for Mozilla Firefox, Opera, and Google Chrome and Netscape 9.0.0.6, or use a TIFF capable browser such as Links or Safari version 3.2.1 (may display the wrong size but allows full images to be saved).
To place a file in this category, add the tag {{PD-OpenClipart}} to the bottom of the file's description page. If you are not sure which category a file belongs to, consult the file copyright tag page .
Wikipedia entry for Google Patents.Google Patents is a search engine from Google that indexes patents and patent applications from the United States Patent and Trademark Office.