U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

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...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!

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Class 188 - Brakes

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522 Subclasses


Subclasses list

Definition

This class includes means for retarding the motion of or stopping machines, including vehicles, both rail and road, and shafts, wheels, pulleys, or other moving mechanisms, by friction, by positive engagement of elements, or by the internal resistance of a fluid or a field of force. Citations from other classes indicating the limits of this class will be found under the various subclass definitions.

Lines with other classes and within this class

Class 192 is the generic locus for clutches and brakes, and see the Class Definition of Class 192 for further discussion of clutches and brakes.

Vehicle shock-absorbers are included in this class unless of the type which flex or put stress upon a spring or springs. These latter are found in Class 267, Spring Devices.

 
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