Patent Law: Prosecution, Infringement Litigation, and IP Portfolio Strategy

Independent claims should span from the broadest functional concept to progressively narrower dependent claims that preserve fallback protection if the broadest claim is later invalidated. Patent prosecution and portfolio management counsel must confirm that the claim language does not include terms previously limited during prosecution of related applications in ways that could narrow the claims under prosecution history estoppel.

An obviousness rejection response must distinguish the claimed invention by arguing that the cited references do not disclose the claimed limitations, that the combination would not have been obvious, or that the invention produces unexpected results. Patent counseling and prosecution counsel must limit any amendments to the minimum necessary to overcome the rejection, since unnecessarily restrictive amendments create prosecution history estoppel that limits the patent's reach under the doctrine of equivalents in subsequent litigation.

The court construes disputed claim terms primarily from the intrinsic record, including the claims, specification, and prosecution history. Patent infringement litigation counsel must analyze the full prosecution history of the asserted patent and all related patents before the Markman hearing, since statements made during prosecution of a parent or sibling application may limit claim scope even if the limitation does not appear in the asserted patent's own prosecution history.

The doctrine of equivalents prevents infringers from escaping liability through insubstantial changes by extending protection to products performing substantially the same function in substantially the same way to achieve substantially the same result. Technology patent law counsel advising on design-around strategies must evaluate whether the proposed modification avoids both literal infringement and infringement under the doctrine of equivalents, since eliminating only one claim limitation still infringes if that limitation's equivalent is present in the accused product.

Technology and IP transactions counsel must coordinate the IPR petition and district court invalidity contentions to avoid inadvertent estoppel while maximizing the probability that at least one invalidity ground succeeds in either forum.

Patent damages must be no less than a reasonable royalty, and where the patentee establishes lost profits, damages may include the profits lost but for the infringement. Punitive damages lawsuit counsel pursuing enhanced damages must document the infringer's actual knowledge of the patent, the absence of any non-infringement opinion of counsel, and conduct demonstrating deliberate copying, since willful infringement supports enhanced damages of up to three times the compensatory award.

A PCT application filed within twelve months of the earliest priority date preserves the right to enter the national phase in over 150 member countries within thirty months, giving the applicant time to evaluate commercial potential before committing to national phase examination costs. Technology licensing and IP transactions counsel must monitor the international search report to identify prior art affecting claims in major markets and develop country-specific strategies addressing the distinct patentability standards of the US, European, Chinese, and Japanese patent offices.

A patent licensing program requires identifying the portfolio's most valuable patents, analyzing the markets and products they cover, and developing a licensing approach ranging from direct negotiation with identified infringers to broader campaigns targeting all market participants. Technology transfer counsel must evaluate whether the portfolio's strongest patents are better deployed as licensing assets, defensive weapons against competitors with threatening IP positions, or acquisition targets for third parties able to generate higher returns through their own commercialization infrastructure.