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Automatically adjustable choke for shotguns

US 2,972,829 A · Inventors: GRAHN ARNE Y

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Overview

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

No Claude kit for weapons

Claude doesn't help design weapons, ammunition or explosives, so this page has no Reinvent kit. To develop this one, work with a federally licensed manufacturer (many of these items are regulated) and a registered patent attorney or agent, listed on the USPTO roster.

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.

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Why it's free to use

  • Granted February 28, 1961. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by February 28, 1978.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledMarch 27, 1958
GrantedFebruary 28, 1961
Term endedFebruary 28, 1978
Application number—
Classification (CPC)F41A21/42
Length4 pages

Timeline

Timeline From USPTO dates

1959196119631965196719691971197319751977Application filedMarch 27, 1958Patent grantedFeb 28, 1961Term endedFeb 28, 1978

Sources & verification

Official USPTO records

Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comJustia PatentsFull text, claims and classification.patents.justia.comFreePatentsOnlineFull text and PDF.freepatentsonline.comEspacenetForeign family and legal status.European Patent Office

Everything on this page comes from the USPTO record linked above.