Honeywell’s Patent Priority Pitch Prevails in Solvay Suit


Solvay, a Belgian chemicals and pharmaceuticals conglomerate, owns U.S. Patent No. 6,730,817 (‘817 patent), entitled “Method for preparing 1,1,1,3,3-pentafluoropropane”.  The ‘817 patent is directed to processes for making HFC-245fa, a hydrofluorocarbon (HFC) that does not deplete the earth’s ozone layer.

The processes claimed in the ‘817 patent are commercially important because HFC-245fa is one of a group of non-ozone depleting HFCs that were legislatively mandated in the 1990’s to replace ozone depleting chlorofluorocarbons and hydrochlorofluorocarbons.

In 2006 Solvay sued Honeywell in federal court in Wilmington, Delaware, accusing the chemicals, security systems and aviation instrument maker of infringing the ‘817 patent by making HFC-245fa at its Louisiana plant.

Recently both parties filed a flurry of summary judgment motions relating to both infringement and validity of the ‘817 patent.  Last month, Honeywell prevailed when Judge Sue L. Robinson ruled that it, not Solvay, was the first to invent the patented chemical process.

The patent law provision at issue in the validity motions was section 102(g).  Section 102(g) of the U.S. patent law governs patent priority disputes. 

It ensures that a patent is awarded to the first inventor by providing that a patent is invalid if the invention was made in the U.S. by someone else before the invention date of the patent applicant.  Section 102(g) also promotes public disclosure of an invention by requiring that the party alleging prior invention did not “abandon, suppress or conceal” his invention. 

A party can prove first invention under section 102(g) by either demonstrating that he was the first to reduce the invention to practice (i.e., the invention is ready to be used for its intended purpose) or he was the first to conceive of the invention and was diligent in attempting to reduce it to practice. 

Honeywell’s summary judgment motion on validity asserted that it was the first inventor under section 102(g) and therefore certain claims of the ‘817 patent are invalid.  Solvay’s cross-motion for summary judgment on validity argued that Honeywell had abandoned, suppressed or concealed the invention and therefore could not be the first inventor under section 102(g).

The research on Honeywell’s chemical process (and conception thereof) was conducted in Russia by contracted engineers in May 1994.  Honeywell replicated the work of the Russian engineers and reduced the invention to practice in August 1995 by using certain methods to purify the HFC-245fa, prior to Solvay’s asserted priority date of October 23, 1995.

Based on its August 1995 reduction to practice date, Honeywell argued that it was entitled to summary judgment that it was the first inventor under section 102(g).  Solvay countered that Honeywell could not be the inventor because the conception was in Russia, not the U.S.

Judge Robinson rejected Solvay’s arguments (honeywell_opinion.pdf), finding no support for the contention that conception must occur in the U.S., and concluding that, in any event, Honeywell had conceived of the invention in the U.S. because it “possessed a definite and permanent idea of the complete and operative invention” upon receiving the information and instructions from the Russian engineers. 

Solvay’s summary judgment motion asserted that it was the first inventor and argued that Honeywell had intentionally abandoned, suppressed or concealed the invention.  Solvay pointed to, among other things, a particular invention questionnaire used in Honeywell’s internal policies allegedly to delay patent filings based on potential for commercialization of the technology and Honeywell’s changes in market predictions based on Department of Energy (DOE) regulatory activity.

Judge Robinson rejected Solvay’s suppression arguments, finding that Honeywell’s questionnaire  is used primarily to determine the most appropriate form of intellectual property protection for an invention, not to suppress inventions or encourage delays in patent filing.  The court also found that, in this instance, Honeywell’s monitoring of DOE regulations ultimately led to earlier disclosure of the invention.

Eric Lane Avatar

Eric Lane

Eric Lane, the founder and principal of Green Patent Law, is an intellectual property lawyer and registered U.S. patent attorney in New York and is a member of the bar in New York and California. Eric has more than two decades of experience working with wind, solar PV, CSP, biofuels, and geothermal, energy storage technologies, carbon capture and sequestration, medical devices, data communications, mechanical, chemical, internet and software.