U.S. patents available from 1976 to present.
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Icon_funbox Did You Know...

...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!

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Class 291 - Track sanders

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Definition

Means for applying sand or like material to vehicle-wheel treads or to vehicle-tracks, such as automobile-roads or railway-rails, or to both the wheel-treads and tracks, for the purpose of increasing the tractive effect between such wheels and roads or rails.

 
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