Inside surface of a filter element having insert construction

USD425977S · kind S · design

Assignee

• Donaldson Company, Inc. · US

Inventors

• Donald F. Engel · Prior Lake, US
• Dolan Bartels · Delphi, US
• John R. Hacker · Edina, US
• Bruce Crenshaw · Frankfort, US
• Don Harold · Prior Lake, US

Key dates

• Filing date: Mar 24, 1998
• Grant date: May 30, 2000
• Expiry date: May 30, 2014

Classification

• Technology area (CPC —): General