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So today starting around 11:21am EST I received about 22 emails from Zazzle informing me that my t-shirt designs with the mathematical symbol PI were being removed due to copyright infringement.  At first I thought it was a mistake, maybe even a joke.  You can not copyright a mathematical symbol.  Right?  Just not possible.  It is used in every day text.  It is a symbol used not only in math but in Greek writings and in the names of  fraternities and sororities.  What about Pi Day?  You just can’t trademark the Pi Symbol- that would be absurb right?

Well  according to Zazzle they think you can.  The emails I received said, ” Your product has been removed due to an infringement claim from Pi Productions Corp. The mathematical symbol “pi” is a registered trademark, U.S. Registration No. 4473631. For more information on the trademark, please visit the United States Patent and Trademark Office at: http://www.uspto.gov/.”

This left me scratching my head and I am sure in the next 48 hours there will be plenty of other Zazzle, Cafe Press, Etsy and other online store owners who will be doing the same.

So.. I did some research. I visited the United States Patent and Trademark Office at: http://www.uspto.gov and looked up the Can you trademark The Mathematical Symbol PIU.S. Registration No. 4473631 Serial # 85785006 AND GUESS WHAT!  The Pi symbol is trademarked…… BUT WAIT.“The mark consists of the pi mathematical symbol followed by a period.” The pi symbol is NOT trademarked by itself (EXACTLY what I KNEW I would find)  The image to the right shows a screenshot of the United States Patent and Trademark Office website with Pi (and period) symbol.  I have included the information that was included on the page in the table below.  If you visit the site there is a lot more information including documents and the timeline that it took to get the trademark (starting in 2012) It also includes a “Specimen” of how the symbol will be used.  This “Specimen” is a white T-shirt with the Pi symbol followed by a period.   There is also a certificate for the trademark which clearly identifies the PI and the Period.

US Serial# 85785006

US Serial# 85785006

Word Mark PI
Goodsand Services IC 025. US 022 039. G & S: Athletic apparel, namely, shirts, pants, jackets, footwear, hats and caps, athletic uniforms. FIRST USE: 20090622. FIRST USE IN COMMERCE: 20100622
Serial    Number  85785006
Filing Date November 21, 2012
Current Basis 1A
Original Filing Basis 1A
Published for Opposition November 12, 2013
Registration Number 4473631
Registration Date January 28, 2014
Owner (REGISTRANT) Paul Ingrisano AKA PI Productions Corp INDIVIDUAL UNITED STATES 1933 73rd street brooklyn NEW YORK 11204
Description of Mark Color is not claimed as a feature of the mark. The mark consists of the pi mathematical symbol followed by a period.
Type of Mark TRADEMARK
Live/Dead Indicator LIVE

So All of the designs that I had up on Zazzle as well as many of my fellow Zazzlers  such as JEZ were not actually infringing on this trademark. None of my designs have a period.  I wonder who at Zazzle made this decision.  I wrote to Zazzle and explained to them the situation however I doubt that Zazzle will reinstate any of the designs and based on the TradeMark Manual of Examining Procedure someone will probably have to challenge this in court!  Which is ridiculous!

Oh and by the way Zazzle is just one of 1,000 of sites with PI related apparel and gifts. Just do a google Search.   Let’s just see where this goes over the next few days!


This brings me to the reason the registrant did this. (Oh I am sure he is enjoying every bit of this)  He or someone from Pi Productions had to report each and every design that is up on their site and ask Zazzle to have them taken down.  BUT WHY? Well the simple answer is now the registrant can turn around a be the SOLE seller of apparel with the PI symbol.  THAT IS JUST CRAZY! A MONOPOLY ON PI? REALLY?  IT IS A MATHEMATICAL SYMBOL!!!!  SO.. who is the registrant?

epidemicThe registrant of this trademark is Paul Ingrisano AKA PI Productions Corp. His personal page can be found on Facebook here and you can on the left how he is using the PI symbol.  Funny that there is no PERIOD.  His company Pi Productions can be found on Facebook here.  The page is all about music and nothing about apparel.   His Linkedin profile is  indicates that he works at Pi Apparel yet no link to said business.  His Etsy shop called PI314US is opened and uses a PI symbol as it’s avatar – but sells no PI related items.  It was opened this past March.  His Twitter Account has been inactive since 2012.

So what are all of us with Pi apparel designs do NEXT?