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v. in·fringed, in·fring·ing, in·fring·es
1. To transgress or exceed the limits of; violate: infringe a contract; infringe a patent.
2. Obsolete To defeat; invalidate.
To encroach on someone or something; engage in trespassing: an increased workload that infringed on his personal life.

[Latin īnfringere, to destroy : in-, intensive pref.; see in-2 + frangere, to break; see bhreg- in Indo-European roots.]

in·fring′er n.
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References in classic literature ?
He was on his feet in the courtroom, battling against an infringer, when, in the middle of a sentence, he fell to the floor, overcome by sickness and the responsibilities he had carried for twelve years.
But after Bell had explained his invention in public lectures before more than twenty thousand people, after it had been on exhibition for months at the Philadelphia Centennial, after several hundred articles on it had appeared in newspapers and scientific magazines, and after actual sales of telephones had been made in various parts of the country, there began to appear such a succession of claimants and infringers that the forgetful public came to believe that the telephone, like most inventions, was the product of many minds.
After the victory over Dolbear, the Bell stock went soaring skywards; and the higher it went, the greater were the number of infringers and blowers of stock bubbles.
Their theory, suitable for primitive and peaceful periods of history, has the inconvenience- in application to complex and stormy periods in the life of nations during which various powers arise simultaneously and struggle with one another- that a Legitimist historian will prove that the National Convention, the Directory, and Bonaparte were mere infringers of the true power, while a Republican and a Bonapartist will prove: the one that the Convention and the other that the Empire was the real power, and that all the others were violations of power.
profits the patentee lost on sales diverted to the infringer (134)).
The first two conditions need to be proved by the infringer, leaving the trade mark owner to prove that section 21 does not apply because the threat was justified.
Any infringer of the patent now must answer only to the new owner and not to the prior owner.
A single reproduction without a copyright notice (even one where the mark had been removed) might have been enough for an infringer to deem it "orphaned" and to use it for free.
rule that an infringer has a "legal obligation to respect valid
Intellectual property specialists at the Birmingham office say they are becoming increasingly concerned that any threats to sue for infringement could backfire with the business being sued by the infringer.
After catching them, the infringer can offer an artist a paltry royalty, and if one does not like it, one can sue.
Unauthorised copying, scanning or distribution is an infringement of this copyright and renders the infringer liable to a claim for infringement.