IP Library › Granted Patent US 3,985,132
Granted Patent Utility
US 3,985,132 · App. 05/532,340

Filter mask

Inventors: Elvin L. Boyce, William Keith Robinson
Patented Case View Patent ↗
Granted: Oct 12, 1976 Filed: Dec 13, 1974
Inventors
Elvin L. Boyce
William Keith Robinson
Assignee (at issue)
Tapelicator, Inc.

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 3,985,132
App. No.
05/532,340
Filed
1974-12-13
Granted
1976-10-12
Kind
A