File:Vacuum flask diagram.png

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A vacuum flask is also known as a thermoflask

DescriptionVacuum flask diagram.png	English: Page from a U.S. patent application. U.S. Patent number 872,795, issue date 1907-12-03. [1]
Date	1907
Source	I downloaded the image as a tiff file from the U.S. Patent Office web site, cropped the image to remove white space, then converted it to a PNG file:
Author	B. Burger 1907

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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2006-08-19 03:30 Cliffb 1626×2652×1 (77993 bytes) Page from a U.S. patent application. U.S. Patent number 872,795, issue date 1907-12-03. [http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=872795] I downloaded the image as a tiff file from the U.S. Patent Office web site, cropped the image to remo

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	22:54, 25 July 2007		1,626 × 2,652 (76 KB)	Akiry (talk \| contribs)	{{Information \|Description=Page from a U.S. patent application. U.S. Patent number 872,795, issue date 1907-12-03. [http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=872795] I downloaded the image as a tiff file from the U.S. Patent Office web site

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