Patent Yard Sign in
Expired, full termArchiveSolo inventor

Manufacture of activated carbon

US 1,783,110 A · Inventors: RUDOLF DEFRIS et al.

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 November 25, 1930. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by November 25, 1947.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledFebruary 27, 1928
GrantedNovember 25, 1930
Term endedNovember 25, 1947
Application number—
Classification (CPC)C01B32/384
Length2 pages

Timeline

Timeline From USPTO dates

1929193119331935193719391941194319451947Application filedFeb 27, 1928Patent grantedNov 25, 1930Term endedNov 25, 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.