IP Library › Granted Patent US 4,774,938
Granted Patent Utility
US 4,774,938 · App. 07/036,118

Slow recovery earplug with largely impenetrable surface

Inventor: Howard S. Leight
Patented Case View Patent ↗
Granted: Oct 4, 1988 Filed: Apr 9, 1987
Inventor
Howard S. Leight
Assignee (at issue)
Howard S. Leight and Associates, Inc.

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Quick Facts
Patent No.
US 4,774,938
App. No.
07/036,118
Filed
1987-04-09
Granted
1988-10-04
Kind
A