Patent · US Expired

Perpetual calendar which utilizes seven month tables and methods of constructing and using the same

US4828290A · kind A · utility

7Cited by
8References
14Claims
0Family size

Inventor

Key dates

Filing dateJan 11, 1988
Grant dateMay 9, 1989
Priority date—
Expiry dateJan 11, 2008

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG09D3/00
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

The invention relates to a pocket calendar which is perpetual and which utilizes two arrays of elements. The first array has coordinates corresponding to the decade and the year. The elements of the array are one of fourteen designators. The second array has coordinates which correspond to the twelve months and to one of seven 31-day month tables which each begin on one of the seven days of the week. Each element of the second array is comprised of two of the designators of the first array. The location of the designator in the second array indicates the month table for the month in question. Funnels direct the user's attention to the proper month table.

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