Patent Yard Sign in
Expired, full termArchiveSolo inventor

Continuous digestion apparatus for the production of highly purified cellulose

US 2,542,801 A · Inventors: ROZA JOAQUIN J DE LA SR

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 February 20, 1951. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by February 20, 1968.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledApril 12, 1945
GrantedFebruary 20, 1951
Term endedFebruary 20, 1968
Application number—
Classification (CPC)D21C7/00 +1 more
Length6 pages

Timeline

Timeline From USPTO dates

19461949195219551958196119641967Application filedApril 12, 1945Patent grantedFeb 20, 1951Term endedFeb 20, 1968

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.