Patent Yard Sign in
Expired, full termArchiveSolo inventor

Preparation of n-substituted hydrazine derivatives

US 2,917,545 A · Inventors: LUM DAVID W et al.

USPTO PDF

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.

Google PatentsUSPTO PDF

Why it's free to use

  • Granted December 15, 1959. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by December 15, 1976.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledSeptember 23, 1957
GrantedDecember 15, 1959
Term endedDecember 15, 1976
Application number—
Classification (CPC)C06B25/34 +2 more
Length2 pages

Timeline

Timeline From USPTO dates

1958196019621964196619681970197219741976Application filedSep 23, 1957Patent grantedDec 15, 1959Term endedDec 15, 1976

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.