IP Library › Granted Patent US 4,287,480
Granted Patent Utility
US 4,287,480 · App. 06/111,134

Phase locked loop out-of-lock detector

Inventors: Billy K. Swift, Anthony F. Zizzo, Willard A. Blevins
Patented Case View Patent ↗
Granted: Sep 1, 1981 Filed: Jan 10, 1980
Inventors
Billy K. Swift
Anthony F. Zizzo
Willard A. Blevins
Assignee (at issue)
Sperry Corp.

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 4,287,480
App. No.
06/111,134
Filed
1980-01-10
Granted
1981-09-01
Kind
A