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Method for determining the quantity of an appropriate chemical that should be added per unit of volume of water in order to fit it for use in the arts

US 1,405,940 A · Inventors: WM RICE CYRUS

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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.

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Why it's free to use

  • Granted February 7, 1922. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by February 7, 1939.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 26, 1918
GrantedFebruary 7, 1922
Term endedFebruary 7, 1939
Application number—
Classification (CPC)C02F5/02
Length3 pages

Timeline

Timeline From USPTO dates

1919192219251928193119341937Application filedJuly 26, 1918Patent grantedFeb 7, 1922Term endedFeb 7, 1939

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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

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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

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