US3864859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perpetual calendar
Assignee: Individual
•
Filing: 1973-08-06
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Granted: 1975-02-11
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Expires: 1993-08-06
Abstract
Abstract A perpetual calendar requiring no numbers, letters, or printed indicia of any kind is disclosed. Locations are provided on the face of the calendar corresponding in position to the hour or minute markings on a clock dial, to which indicating markers designating the decade, year, month, date, day of the week and days in the month are removably attached.
Inventors
- 👤 Len Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:19
CPC Classifications
G; G09; G09D; G09D3/00; G09D3/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
240 words
A perpetual calendar requiring neither numbers, letters, words nor printed matter to be read, which comprises: a planar base; a decade-indicating marker; means for locating and detachably affixing said decadeindicating marker selectively, within a first circular pattern on the planar surface of said base to correspond in position to the hourly markings on a clock dial from 1 o''clock to 9 o''clock inclusively; a year-indicating marker; means for locating and detachably affixing said year-indicating marker selectively, within a second circular pattern on the planar surface of said base to correspond in position to the hourly markings on a clock dial from 1 o''clock to 9 o''clock inclusively; a month-indicating marker; means for locating and detachably affixing said month-indicating marker selectively, within a third circular pattern on the planar surface of said base to correspond in position to the hourly markings on a clock dial from 1 o''clock to 12 o''clock inclusively; seven day-indicating markers, visually distinguishable from each other; and means for locating and detachably affixing said day-indicating markers selectively, within a fourth circular pattern on the planar surface of said base to correspond in position to the minute markings on a clock dial from 1 minute past the hour to 31 minutes past the hour inclusively, whereby the relative location of each of said above markers, in combination, corresponds in position to the time display on a conventional clock dial with the composite display indicating a specific calendar date.
Claim 2
Dependent Claim
240 words
A perpetual calendar requiring neither numbers, letters, words nor printed matter to be read, which comprises: a planar base; a decade-indicating marker; means for locating and detachably affixing said decadeindicating marker selectively, within a first circular pattern on the planar surface of said base to correspond in position to the hourly markings on a clock dial from 1 o''clock to 9 o''clock inclusively; a year-indicating marker; means for locating and detachably affixing said year-indicating marker selectively, within a second circular pattern on the planar surface of said base to correspond in position to the hourly markings on a clock dial from 1 o''clock to 9 o''clock inclusively; a month-indicating marker; means for locating and detachably affixing said month-indicating marker selectively, within a third circular pattern on the planar surface of said base to correspond in position to the hourly markings on a clock dial from 1 o''clock to 12 o''clock inclusively; seven day-indicating markers, visually distinguishable from each other; and means for locating and detachably affixing said day-indicating markers selectively, within a fourth circular pattern on the planar surface of said base to correspond in position to the minute markings on a clock dial from 1 minute past the hour to 31 minutes past the hour inclusively, whereby the relative location of each of said above markers, in combination, corresponds in position to the time display on a conventional clock dial with the composite display indicating a specific calendar date.
Claim 3
Dependent Claim
46 words
Perpetual calendar according to claim 1, wherein said means for locating and detachably affixing said decade-, year-, month-, and day-indicating markers are hollow sockets, and wherein said decade-indicating, year-indicating, month-indicating, and day-indicating markers are pegs complementary to and adapted to fit into said corresponding hollow sockets.
Claim 4
Dependent Claim
40 words
Perpetual calendar according to claim 1, wherein said month-indicating marker has appended thereto pointing means for denoting the number of days in each month when detachably affixed to each of said means for locating and detachably affixing said month-indicating mArker.
Claim 5
Dependent Claim
22 words
Perpetual calendar according to claim 1, wherein said seven day-indicating markers are visually distinguishable from one another by being of different colors.
Claim 6
Dependent Claim
72 words
Perpetual calendar according to claim 1, wherein said means for locating and detachably affixing said day-indicating markers selectively arranged on the surface of said base to correspond in position to the minute markings on a clock dial from 1 minute past the hour to 32 minutes past the hour inclusively, and further comprising an eighth day-indicating marker, visually distinguishable from said seven day-indicating markers, for denoting the final day of each month.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |