Patent Yard Sign in
Expired Australian patentAustralia

Minimising the number of spooling means needed for equalisingthe length of strands inserted into a well

AU 1985050056 · Applicant: Shell Internationale Research Maatschappij Bv

AusPat record

Overview

Drawings and full text

Its specification, documents and status are on IP Australia's AusPat.

Open the AusPat record

Read the whole patent

Listed from its IP Australia record in Patent Yard's archive of Australian patents past their term. Its claims, description and drawings are in the AusPat record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Filed November 19, 1985 and granted June 6, 1988. An Australian standard patent lasts 20 years from its date of patent, which is at most a year after this filing, so its term ended by November 19, 2006.
  • A pharmaceutical extension adds at most five years, so even that would have ended by November 19, 2011.
  • We check Australian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 19, 1985
GrantedJune 6, 1988
Term ended byNovember 19, 2006
Application numberAU 1985050056
Classification (IPC)E21B19/22 +2 more

Timeline

Timeline From IP Australia dates

1986198919921995199820012004Application filedNov 19, 1985Patent grantedJune 6, 1988Term ended byNov 19, 2006

Sources & verification

Everything on this page comes from the IP Australia record linked above. Data from IP Australia's IPGOD, licensed under CC BY 2.5 AU.