IP Library › Granted Patent US 4,700,840
Granted Patent Utility
US 4,700,840 · App. 06/829,720

Data card cassette

Inventor: Richard M. Haddock
Patented Case View Patent ↗
Granted: Oct 20, 1987 Filed: Feb 14, 1986
Inventor
Richard M. Haddock
Assignee (at issue)
Drexler Technology Corporation

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 4,700,840
App. No.
06/829,720
Filed
1986-02-14
Granted
1987-10-20
Kind
A