Wacom patents
Last updated
Last updated
Wacom brought EMR technology to drawing tablets decades ago. In the process they held the original patents (long since expired) and have many new ones.
Wacom lists all their patents here:
If you have time for some technical reading, these patents below describe some key aspects of EMR technology.
US Patent 4,878,553 - POSITION DETECTING APPARATUS
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Date Filed: 1987/09/14
Date of Patent: 1989/11/07
Status: EXPIRED
US Patent 4,999,461 - COORDINATES INPUT APPARATUS ()
Date Filed: 1989/05/19
Date of Patent: 1991/03/12
Status: EXPIRED
US Patent 5,134,689 COORDINATE INPUT SYSTEM AND INPUT IMPLEMENT USED IN THE SYSTEM
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Date Filed: 1988/08/24
Date of Patent: 1992/07/28
US Patent 5,691,513 SCANNING METHOD FOR SENSOR COILS IN COORDINATE DATA INPUT DEVICE
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Date Filed: 1995/09/25
Date of Patent: 1997/11/25
Status: EXPIRED
US Patent Reissue 4,786,765 COORDINATES INPUT SYSTEM
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Date Filed: 1987/07/23
Date of Patent: 1988/11/22
Status: Ceased
US Patent Reissue 5,023,408 ELECTRONIC BLACKBOARD AND ACCESSORIES SUCH AS WRITING TOOLS
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Date Filed: 1989/06/13
Date of Patent: 1991/06/11
Status: Ceased