Patent Yard Sign in
Expired, full termArchiveSolo inventor

Spring-rewinding means

US 1,770,775 A · Inventors: HALL CHESTER I

USPTO PDF

Overview

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

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, and the Claude kit works from them.

Google PatentsUSPTO PDF

Why it's free to use

  • Granted July 15, 1930. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by July 15, 1947.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledApril 12, 1928
GrantedJuly 15, 1930
Term endedJuly 15, 1947
Application number—
Classification (CPC)G04C1/065
Length4 pages

Timeline

Timeline From USPTO dates

1929193119331935193719391941194319451947Application filedApril 12, 1928Patent grantedJuly 15, 1930Term endedJuly 15, 1947

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.