Expired European patentEurope
Frequency synthesizer
EP 0471487 B1 · Applicant: Hughes Aircraft Company
Overview
The published document from the EPO: 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 EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents.
Why it's free to use
- Filed August 2, 1991 and granted September 17, 1997. A European patent lasts at most 20 years from filing, so its term ended August 2, 2011.
- A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by February 2, 2017.
- We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledAugust 2, 1991
PublishedFebruary 19, 1992
GrantedSeptember 17, 1997
Term endedAugust 2, 2011
Application numberEP 91307130
Classification (CPC)F41G7/308 +2 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.