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US 1,843,237 A · Inventors: MCGIFFERT STEPHEN Y 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 February 2, 1932. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by February 2, 1949.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMarch 9, 1929
GrantedFebruary 2, 1932
Term endedFebruary 2, 1949
Application number—
Classification (CPC)F41G3/28
Length14 pages

Timeline

Timeline From USPTO dates

1930193219341936193819401942194419461948Application filedMarch 9, 1929Patent grantedFeb 2, 1932Term endedFeb 2, 1949

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