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Perpetual calendar

  • US 4,813,707 A
  • Filed: 03/11/1988
  • Issued: 03/21/1989
  • Est. Priority Date: 03/11/1988
  • Status: Expired due to Fees
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1. A Perpetual calendar for determining the day of the week for a certain date comprising a plurality of interrelated tables including a first chart having ten sections of which the first 4 sections comprising seven rows indexed consecutively by integers from 1 to 28 and each having four columns headed by integers from 0 to 3, followed by five sections each having seven rows listing in predetermined order integers from 1 to 12 for certain five different calendar systems, and a table having integers from 1 to 7 arranged in a specific manner in seven rows and seven columns, a second table having four sections with seven rows consecutively indexed by integers of from 1 to 28 and each having four columns headed by integers from 0 to 4, a third table having four sections with seven consecutively indexed rows by integers of from 1 to 28 and seven columns headed by integers from 0 to 6, each such section presenting in rows and columns numbers arranged in a fashion suitable to determine calendar information, a fourth table having three sections, the first and third sections thereof each having four columns headed by integers from 0 to 4 and having four rows of integers from 1 to 7 arranged in a particular fashion, and a second section having a first row with integers from 0 to 6 arranged in a certain manner and affiliated with the third section, a second row having integers from 0 to 6 arranged in another fashion, and four rows of integers of 1 to 28 arranged in a lateral and consecutive manner, a fifth and sixth table each having four sections, the first section having eight rows listing integers from 1 to 100 in a consecutive and vertical manner, followed by three sections each having six rows and displaying two sets of integers from 1 to 7 in a peculiar manner, a seventh table having a first set of three columns together displaying integers from 1 to 21 in a consecutive manner, and a second set of two columns the first of which carrying consecutively the value 0 and positive integers from 1 to 6, and the second of which displaying consecutively the value 0 and negative integers from 1 to 6;

  • and an eighth table having a first column carrying integers from 1 to 7 and a second column displaying the says of the week; and

    a ninth table having three columns wherein the first column displays integers from 1 to 8 consecutively, the second column displays integers from 1 to 7 in a non-consecutive order, and the third column carries non-sequential integers ranging from 1 to 15 in a non-consecutive manner;

    wherein said first four sections of the first table, the second, third, fourth, seventh and ninth table relate to the fifth, sixth, seventh, eighth, ninth and tenth section of the first table, the fifth and sixth table are correlated with the seventh table, and the tenth section of table 1 is correlated with the eighth table.

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