Patent · US Expired

Bubble detector

US5723773A · kind A · utility

35Cited by
13References
16Claims
0Family size

Assignee

Inventor

Key dates

Filing dateNov 22, 1996
Grant dateMar 3, 1998
Priority date—
Expiry dateNov 22, 2016

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01N2291/102
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

The presence of bubbles on such photographic material, as is well known, results in significant defects in the photographic materials produced so that it is important, in the manufacture of such photographic materials, to detect the presence of such bubbles in the liquid emulsion and to take appropriate remedial action. Described herein is a bubble detector comprising a conduit for liquid to be monitored, the conduit having opposing flattened, generally parallel walls, and a transducer engaged with one of the generally parallel walls and operable to apply alternating displacements to one of the generally parallel walls, at an ultrasonic frequency, in a direction generally normal to the generally parallel walls to transmit sonic or ultrasonic waves through liquid passing through the conduit.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.