U.S. patents available from 1976 to present.
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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.

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Class 278 - Land vehicles: animal draft appliances

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134 Subclasses


Subclasses list

Definition

This class includes that portion of land vehicles by means of which the pull of draft animals is utilized to move the vehicle over the ground.

Lines with other classes and within this class

This class is subordinate to Class 280, Land Vehicles, and is distinguished therefrom, as indicated in the class definition above.
 
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