Screw machine
CA 1264250 C · Owner: Gusman, Moisei T. · Inventors: Baldenko, Dmitry F.; Vadetsky, Jury V.; Gusman, Moisei T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A screw machine is primarily designed for drilling oil and gas wells. The screw machine comprises consecutively mounted screw mechanisms incorporating coaxially arranged stators and rotors disposed therein whose axes are displaced with respect to the central axis of the stators to the value of eccentricity "e" of the screw mechanisms. The screw mechanisms are grouped into modules and the modules are grouped into blocks. The axes of the rotors of the screw mechanisms in the module and the modules proper in the block are arranged symmetrically relative to the central axis.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 9, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 9, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.