Patent · US Expired

Hourglass novelty apparatus having unequal chamber volumes

US5093815A · kind A · utility

2Cited by
2References
2Claims
0Family size

Inventor

Key dates

Filing dateApr 23, 1990
Grant dateMar 3, 1992
Priority date—
Expiry dateApr 23, 2010

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG04F1/06
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

Apparatus for measuring time which comprises a first chamber and a second chamber. The second chamber is bigger than the first chamber. The structure includes apparatus for mounting the first and second chambers in generally aligned relationship and for coupling the first and second chambers to allow passage of a fluent particulate material between the first and second chambers. A quantity of fluent particulate matter having a volume substantially equal to the second chamber is disposed within the volume of the first chamber, the second chamber and the apparatus for coupling.

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