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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 ?
The other group received Interferential current (IFC) treatment from IFC machine (ENRAF-NONIUS), by a four-pole method with Dipole vector (automatic).
An interferential scanning principle that produces scanning signals with a signal period of 4 [micro]m.
Clients often receive ultra-sound, acupuncture, traction, and interferential therapy, often with no posture, exercise or life-style advice.
As the carrier frequency is hopping, it possesses resisting single frequency and partial bandwidth interferential ability.
Various physiotherapeutic modalities like ultrasound, magnetic field, interferential current and diathermy have been found beneficial in the management of spinal trauma, pain and posterior paresis, but their effects on body systems have not been documented.
Chiropractors use multiple "therapeutic techniques: spinal manipulative therapy, diet, exercise, X-rays, interferential and electrogalvanic muscle stimulation, etc.
Second, investigations into the aerodynamic properties of an original city site embracing many various industrial or civil buildings, when interferential and other properties of airflows form sub-climate conditions have been conducted ([TEXT NOT REPRODUCIBLE IN ASCII] et al.
Effectiveness of transcutaneous electrical nerve stimulation and interferential current in primary dysmenorrhea.
Interferential and horizontal therapies in chronic low back pain due to multiple vertebral fractures: a randomized, double blind, clinical study.
15 Another study investigated elec-trical stimulation's effectiveness even in improving quadriceps strength in healthy subjects and com-pared interferential and low-frequency current in terms of the effects on quadriceps strength and per-ceived discomfort.