Marhefka; Duane

Patent Applications and Registrations

Patent applications and USPTO patent grants for Marhefka; Duane.The latest application filed is for "liquid crystal writing device with slow discharge erase".

Company Profile

4.6.9

Marhefka; Duane - Winona OH
Marhefka; Duane - Kent OH
Marhefka; Duane - Copley OH

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Liquid crystal eWriter system with resistive digitizer and having mechanical palm rejection Grant 10,649,261 - Lightfoot , et al.	2020-05-12
Selectively erasable eWriter with user adjustment Grant 10,634,939 - Marhefka , et al.	2020-04-28
Liquid crystal writing device with slow discharge erase Grant 10,558,065 - Marhefka Feb	2020-02-11
Liquid Crystal Writing Device With Slow Discharge Erase App 20190317348 - MARHEFKA; Duane	2019-10-17
Selectively Erasable Ewriter With User Adjustment App 20190056611 - MARHEFKA; Duane ; et al.	2019-02-21
Liquid Crystal Ewriter System With Resistive Digitizer And Having Mechanical Palm Rejection App 20180031886 - LIGHTFOOT; Mark ; et al.	2018-02-01
Cholesteric Liquid Crystal Writing Tablet Erased By A Piezoelectric Transducer App 20130342432 - Schneider; Tod ; et al.	2013-12-26
Video rate ChLCD driving with active matrix backplanes Grant 8,436,847 - Marhefka , et al. May 7, 2	2013-05-07
Writing Tablet Information Recording Device App 20130107144 - Marhefka; Duane ; et al.	2013-05-02
Writing Tablet Information Recording Device App 20120268420 - Marhefka; Duane ; et al.	2012-10-25
VIDEO RATE ChLCD DRIVING WITH ACTIVE MATRIX BACKPLANES App 20110128265 - Marhefka; Duane ; et al.	2011-06-02
Power management method and device for low-power displays Grant 7,675,239 - Marhefka , et al. March 9, 2	2010-03-09
Power Management Method And Device For Low-power Displays App 20080037306 - Marhefka; Duane ; et al.	2008-02-14
Method And Apparatus For Driving Bistable Liquid Crystal Display App 20070279350 - Huang; Xiao-Yang ; et al.	2007-12-06

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