IP Library › Granted Patent US 4,940,997
Granted Patent Utility
US 4,940,997 · App. 07/390,807

Out-of-ink sensing method

Inventors: Mindy A. Hamlin, George T. Kaplinsky
Patented Case View Patent ↗
Granted: Jul 10, 1990 Filed: Aug 8, 1989
Inventors
Mindy A. Hamlin
George T. Kaplinsky
Assignee (at issue)
Hewlett-Packard Company, L.P.

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 4,940,997
App. No.
07/390,807
Filed
1989-08-08
Granted
1990-07-10
Kind
A