Patent · US Expired

Gap measuring device for defining the distance between two or more surfaces

US4070116A · kind A · utility

82Cited by

2References

9Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Albert Frosch
Walter Mannsdorfer · Aidlingen, DE
Claus Scheuing · Lorch, DE

Key dates

Filing date	Jun 11, 1976
Grant date	Jan 24, 1978
Priority date	—
Expiry date	Jun 11, 1996

Classification

Technology area (CPC G)Physics
CPC primaryG01B11/14
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

Disclosed is an apparatus for measuring the distance between two or more surfaces by means of a periodically shiftable imaging system and focus detectors.

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