U.S. patents available from 1976 to present.
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...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.

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Class D04/112 - Asymmetrical in top plan view


Subclass of Class D04 - Brushware
Definition: Design that is without balance or symmetry as view from
No. of patents: 6
Last issue date: 01/17/2012


NumberTitleIssue Date
D652217Toothbrush
01/17/2012
D648134Toothbrush
11/08/2011
D640469Toothbrush
06/28/2011
D617564Toothbrush
06/15/2010
D590599Toothbrush
04/21/2009
D501322Toothbrush handle
02/01/2005
 
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