Tuesday, December 11, 2012

Lawsuit Summary - Zanfel vs. Lowell Mac

Zanfel (plaintiff) logged a complaint against Lowell Mac (defendant) for patent infringement on in the U.S. District Court of Michigan (case no. 1:12-cv-01339) on Monday, December 09, 2012.

Zanfel Laboratories is in the business of producing dermatological consumer products. The product developed is also the name of the company including Zanfel® Poison Ivy and Oak & Sumac Wash and sold in pharmacies nationwide. Merilyn Fedak operates business under the name of Lowell Mac.

The patents involved in this suit are 

Patent Number
Current Assignee[*]
Issued Date
Expiration Date[†]

Mar 07, 2006
Jul 03, 2019
Urushiol induced contact dermatitis solution

Jul 23, 2002
Jul 03, 2019
Urushiol induced contact dermatitis and method of use
Note: Table information is sourced from Maxval’s Assignment Database and Litigation Database.                                                    

William M. Yarbrough transacts business under the name of Zanfel that markets the product as a wash for treating poison ivy, oak and sumac exposure. He also established William M. Yarbrough Foundation, a charitable, non-profit organization and the Zanfel patents are licensed to the foundation, which is its sole owner, as the federal lawsuit states. Zanfel (see Fig.1) removes the oily toxin called urushiol from the skin. Zanfel is sold without a prescription, and is available through drug stores and www.zanfel.com. The complaint says that the defendant has infringed the above patents by manufacturing and selling a product indicated for the treatment of poison ivy at amazon.com

Zanfel has recently filed patent infringement case against the following companies/individuals:

Case Number
Date Filed
Janet Ziff
Frank Turrentine
If you are interested in knowing more about the cases filed by Zanfel, please contact us.

For more details, visit MaxVal-IP and subscribe to our Litigation Alerts.

[*]MaxVal offers Patent Assignment Alert service where subscribers receive email alerts when assignments relating to target applications, patents or entities of interest are recorded.
[†] Expected expiration date. Patent Term Estimator is a free web-based tool that automatically calculates patent terms and expiration dates for U.S. utility patents.

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