European application, no grantEurope
Flame arrestor device with porous membrane
EP 0109804 A1 · Applicant: HERCULES INCORPORATED
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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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 November 10, 1983 and never granted as a European patent. Had it been granted, its 20-year term would have ended November 10, 2003.
- 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 May 10, 2009.
- 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.
FiledNovember 10, 1983
PublishedMay 30, 1984
GrantedNever granted
Term endedNovember 10, 2003
Application numberEP 83306857
Classification (CPC)A62C4/00 +1 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.