Patent comparison

Compare Patents

Compare two patents side by side. Add ?a=us/7657849&b=us/8046721 to the URL to load specific patents.

US 3668658

How the Floppy Disk's Protective Jacket Cleans the Disk

An IBM patent from 1972 describing a protective, non-removable cover for a magnetic disk that uses a built-in cleaning material to wipe the disk surface while it spins.

Statusexpired

Granted1972

Expires1989

Claims9

Forward citations79

Prior art2

AssigneeInternational Business Machines Corp

InventorsRalph Flores, Herbert E Thompson

Read full analysis →

Patent B

Add ?b=us/7657849 to compare

Find a patent

How to use

Bookmark a comparison URL to save it. Format: /compare?a=[country]/[number]&b=[country]/[number]. Example: /compare?a=us/7657849&b=us/8046721