IP Library › Granted Patent US 4,940,087
Granted Patent Utility
US 4,940,087 · App. 07/357,528

Seating arrangement and structure of a spool within a well casing

Inventors: Neil C. Lien, Donald G. Olsen
Patented Case View Patent ↗
Granted: Jul 10, 1990 Filed: May 26, 1989
Inventors
Neil C. Lien
Donald G. Olsen
Assignee (at issue)
BAKER MANUFACTURING COMPANY, INC.

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Quick Facts
Patent No.
US 4,940,087
App. No.
07/357,528
Filed
1989-05-26
Granted
1990-07-10
Kind
A