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US 1,782,292 A · Inventors: DRIGGS JR LOUIS L et al.

USPTO PDF

Overview

The published document from the USPTO: abstract, claims, description and drawings. Open it full size

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Read the whole patent

Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents.

Why it's free to use

  • Granted November 18, 1930. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by November 18, 1947.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledNovember 12, 1929
GrantedNovember 18, 1930
Term endedNovember 18, 1947
Application number—
Classification (CPC)F42B4/28
Length5 pages

Timeline

Timeline From USPTO dates

193019321934193619381940194219441946Application filedNov 12, 1929Patent grantedNov 18, 1930Term endedNov 18, 1947

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