Patent & IP news archive

Complaint for Patent Infringement
Civil Action No. 1:13-cv-01033-UNA; no judge yet assigned.
Filed on June 7, 2013 in the U.S. District Court for the District of Delaware;

Plaintiffs

v.
Optical Devices
Pepper Hamilton LLP; Wilmington, DE
Edmond D. Johnson
James Gordon McMillan

Patents in case

  • 6,904,007: “Digital servo system with loop gain calibration” by Kadlec et. al. Prosecuted by MacPherson Kwok Chen & Heid LLP Hallman; Jon W.. Includes 16 claims (2 indep.). Was application 09/950,519. Granted 6/7/2005.
  • 6,970,410: “Focus detection in a digital focus servo system” by Kadlec et. al. Prosecuted by Hallman; Jon MacPherson Kwok Chen & Heid. Includes 6 claims (2 indep.). Was application 09/950,394. Granted 11/29/2005.
  • 7,196,979: “Calibration storage methods for a digital focus and tracking servo system with calibration” by Kadlec et. al. Prosecuted by Hallman; Jonathan W. MacPherson Kwok Chen & Heid LLP. Includes 18 claims (2 indep.). Was application 09/950,360. Granted 3/27/2007.
  • 7,839,729: “Optical drive servo with a servo processor receiving photodetector signals” by Kadlec. Prosecuted by Haynes & Boone, LLP.. Includes 10 claims (3 indep.). Was application 11/969,190. Granted 11/23/2010.
  • 6,809,995: “Digital focus and tracking servo system” by Kadlec et. al. Prosecuted by MacPherson Kwok Chen & Heid LLP. Includes 21 claims (2 indep.). Was application 09/950,516. Granted 10/26/2004.
  • 8,416,651: “Servo control using digital signal processing for optical disk drive” by Kadlec.. Includes 39 claims (4 indep.). Was application 12/952,135. Granted 4/9/2013.
  • 6,847,597: “Optical disk drive with a digital focus and tracking servo system” by Kadlec et. al. Prosecuted by MacPherson Kwok Chen & Heid LLP. Includes 18 claims (1 indep.). Was application 09/950,365. Granted 1/25/2005.

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Case documents (PDF)

Fig. 1 from 6,847,597

6,847,597 figure 1

Litigant weblinks

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