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In the law of Patents, the presence of two pending applications, or an existing patent and a pending application that encompass an identical invention or discovery.

When interference exists, the Patent and Trademark Office conducts an investigation to ascertain the priority of invention between the conflicting applications, or the application and the patent. A patent is customarily granted to the earlier invention.


noun antagonism, antipathy, bar, barrier, censure, check, collision, conflict, contravention, damper, disapproval, disturbance, encumbrance, fetter, frustration, hindrance, impediment, imposition, interception, intercession, intermediacy, interruption, intervention, intrusion, invasion, meddling, nuisance, obstruction, onus, opposition, resistance, restraint, setback, stricture, stumbling block
Associated concepts: contempt, frustration of contract, interrerence with contractual relations
See also: bar, barrier, burden, check, collision, conflict, damper, deterrence, deterrent, disadvantage, dispute, embargo, encroachment, encumbrance, fetter, filibuster, frustration, handicap, hiatus, hindrance, impediment, imposition, infringement, intercession, interruption, intervention, intrusion, invasion, mediation, molestation, nuisance, obstruction, onus, opposition, prohibition, resistance, restraint, veto
References in periodicals archive ?
13, 14] to test the cyclic spatial geometric phase by inducing a relative phase shift of 2[pi] between the interfering neutron beams in a perfect silicon single-crystal interferometer.
This was then repeated with the gas cell out of the interferometer, to obtain the interferometer offset phase.
Precision optics are used in a variety of products, many for growing nanotechnology applications, and include lithography systems, medical and scientific instruments, optical fabrication equipment, lasers, astronomy, metrology systems, process-control systems, optical test and measurement equipment, and interferometers.
The contract is the purchase of 1 Fizeau interferometer, the wavelength (lambda):
In a famous example of interferometry gone awry, a misaligned part in an interferometer used to test the mirror for the Hubble Space Telescope caused engineers to distort that mirror's shape, initially saddling the billion-dollar instrument with fuzzy vision.
Typical 6-inch beam expanded interferometers force manufacturers to provide "stitched" data, which is prone to significant errors for optics larger than 12 inches (305mm).
En route to the ultimate goal of a portable matter-wave interferometer, we hope to break new ground in the understanding of important aspects of matter-wave interferometry with interacting atomic gases.
The ultrasonic wave source is a small conical piezoelectric transducer (designed as an acoustic emission sensor), and the displacement detector is a low power (1 mW) laser interferometer of special design.
By its nature, any interferometer can only examine small objects in the sky, not large swaths of the heavens.
Caltech researchers have already shown that they can measure such small displacements on a prototype interferometer with shorter arms, notes LIGO director Barry C.
He has also been involved in the design and production of metrology instruments for DWDM filter characterization and in-situ film-deposition metrology, as well as simultaneous phase-shifting interferometry, with experience ranging from interferometer design, to the design, assembly and alignment of supplemental optics for use in optical metrology.
An optical fiber interferometer is used to measure the deflection of the cantilever.