Patent Attorneys Know Every Letter of the Alphabet in the Issued Patent Counts!
Can getting a single letter of the alphabet wrong in an issued patent spell disaster when it comes to litigating against infringers? Unless the mistake is seen as being a minor typographical error that can be corrected by filing a certificate of correction, the answer is a resounding yes.
Hats off to Peter Zura of The 271 Patent Blog for his post on Central Admixure Pharmacy Services v. Advanced Cardiac Solutions (06-13-07).
In this case, Central Admixture Pharmacy Services sued Advanced Cardiac Solutions for patent infringment relating to a chemical solution used duriing heart surgery.
A certificate of correction was sought on the patent and was issued by the patent office to replace all instances of the word "osmolarity" with the word "osmolality".
You might be thinking that all the certificate does is change the "R" in osmolaRity with a "L" so that it reads osmolaLity. Well, yes, BUT….
Whether or not the certificate of correction is proper depends upon whether the change is a clerical or typographical nature or if it constitutes new matter or would require re-examination. Although the district court found the certificate of correction proper, the CAFC disagreed and found that the result of the correction was to broaden the claims since the corrected claims using the term osmolaLity cover less concentrated solutions than the original osmolaRity.
Yikes! Needless to say, non-technical proofreaders or computerized spell-check and grammar checking programs (gasp!) are not adequate alternatives to a careful final review of a patent application by someone familiar with the technical vocabulary of the invention.