File:Hydrostatic transmission US2360025 page 1.png

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Description
English: Patent drawing for an automatic hydrostatic transmission for on- and off road vehicles with variable axial piston pump and variable axial piston motor in the same housing, with main pressure/return-oil ports assembled "back-to-back" to form a compact unit without the need for hydraulic tubes or hydraulic hoses. Stepless hydrostatic gear ratio with theoretical max. torque ratio 1:1000.
Date June 6, 1941 (filing date at USPTO)
Source Patent USPTO No. 2360025, page 1 (24)
Author Gunnar A. Wahlmark, Rockport Illinois, USA
Permission
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Public domain The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)

The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.

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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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current16:13, 15 September 2009Thumbnail for version as of 16:13, 15 September 20091,768 × 2,788 (126 KB)Lidingo (talk | contribs){{Information |Description={{en|1=Patent drawing for an automatic hydrostatic transmission for on- and off road vehicles with variable axial piston pump and variable axial piston motor in the same housing, with main pressure/return-oil ports assembled "ba

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