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

Icon_funbox Did You Know...

...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."

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Class 182 - Fire escape, ladder, or scaffold

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291 Subclasses


Subclasses list

Definition

This class includes (1) structures supported in spaced relation to the earth"s surface for supporting a workman adjacent a structure being worked on, (2) means for climbing comprising a stile having steps or rungs, (3) means ancillary to normal egress means to traverse a vertical distance to facilitate quick escape from a structure in case of emergency not elsewhere provided for and (4) torso harness, for rescue or escape operations, with or without a tether anchored to the work or to a worker"s support.

 
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