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I have successfully represented the following companies involving a wide array of patent law issues, including patent drafting and prosecution, as well as with Inter Partes Review at the US Patent Office and patent litigation in District Court:


Recent Results


US8,398,037 - Really Right Stuff (RRS) asserted this patent against Leofoto products by canceling multiple Amazon listings. After Leofoto retained my firm to perform a prior art search, I worked closely with the client to identify multiple highly relevant publications which led to the filing of an Inter Partes Review at the USPTO.  The IPR petition has been filed and a filing date has been accorded:

US9,148,480 - ON24 asserted this patent against by filing an infringement action in Northern California District Court. Not happy with the performance of their previous patent law firm, retained my firm to take over the defense. I filed a motion requesting a claim construction hearing to construe a term under 35 USC § 112(6) in connection with an invalidity defense under 35 USC § 112(2).  ON24 objected to the claim construction for being untimely, forcing the Court to hold a hearing on the issue. During the hearing, I argued that claim construction can still occur as part of a Motion for Summary Judgement since the invalidity argument under 35 USC § 112(2) was asserted in the Defendant's original invalidity contentions. The Court agreed with me and will proceed with claim construction under 35 USC § 112(6) when deciding our Motion for Summary Judgement. The Motion for Partial Summary Judgement has been filed. The Reply to Plaintiff's response/opposition has been filed.




US6,773,172, US10,585,337, US10,612,718 - Really Right Stuff (RRS) asserted these patents against Field Optics Research (FOR) by filing an Infringement action in Utah Federal District Court. I joined the FOR defense team and filed amended contentions to add multiple non-infringement and invalidity arguments. The motion to amend was granted, the previously filed claim construction briefs were vacated, and the Court ordered new briefs be filed before the claim construction hearing. New claim construction brief and motion for partial summary judgement filed. Response claim construction brief filed. Reply to Plaintiff's response to motion for summary judgement filed. Reply claim construction brief filed. Claim construction hearing held on 06/26/2023.

Client Testimonials

John Desmond, Desmond Photographic: "Mr. Sheerin has a deep knowledge of patent issues. Very thorough prior art investigation. A great advocate for anyone involved in a patent dispute."

Vince Warner, Field Optics Research: "Once I added Mr. Sheerin to my defense team, he elevated my case from a C+ to A+ almost immediately."

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