Patent · US Expired

Multi-disk rotatable year calendar

US4026052A · kind A · utility

3Cited by
1References
5Claims
0Family size

Inventor

Key dates

Filing dateMar 22, 1976
Grant dateMay 31, 1977
Priority date—
Expiry dateMar 22, 1996

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG09D3/08
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

A calendar comprising a date disk and a week disk which are rotatably coupled with each other. The date disk has date figures and the week disk has week indicating letters. The calendar has further month indicating letters and formations for bringing unnecessary month indicating letters into the invisible state. The date disk and the week disk may be corresponded according to the selected month by relatively rotating both disks and selecting the month indicating letter.

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