Patent US4251935A successfully refreshed from Google Patents.
US4251935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perpetual calendar
Assignee: Individual
•
Filing: 1979-03-20
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Granted: 1981-02-24
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Expires: 1999-03-20
Abstract
Abstract A perpetual calendar in the form of a desk calendar or wall supporting calendar including a front panel with a window cutout revealing a laterally movable slide having a projecting tab thereon engageable with notches or seats to properly locate the slide in relation to the window and maintain the slide in position. The calendar also includes printed indicia above the window opening indicating the days of the week and printed indicia below the window opening indicating the years. The slide includes indicia indicating the date of the month and additional indicia indicating the month of the year thereby providing easily adjusted indicia which can be readily observed to provide a calendar which will properly indicate the day of the week, the month, the date of the month and the year for many years.
Inventors
- 👤 Marvin A. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:08
CPC Classifications
G; G09; G09D; G09D3/00; G09D3/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
290 words
A perpetual calendar comprising a front panel having a window therein, a calendar slide supported behind the front panel in registry with the window, said slide including day of the month indicia thereon and month of the year indicia thereon located below the day of the month indicia, said indicia being observable through the window, said front panel including indicia above the window indicating the day of the week and indicia below the window indicating the year date, said slide including a tab adjacent the lower edge thereof to form a handle for moving the slide laterally of the front panel and window to align the month of the year with the year date thereby providing a calendar for that month of that year, said tab being aligned vertically with the first day of the month indicia, said front panel including a slot therein paralleling the bottom edge of the window and located adjacent thereto and above the year date indicia, said tab projecting through the slot, the bottom edge of the slot including a plurality of notches therein defining seats for the tab thereby locating and positioning the slide in adjusted position, the year indicating indicia being disposed in vertical columns, said month of the year indicia on the slide being arranged in vertical columns whereby the tab placed in one of the notches will be aligned with at least one year of the year indicia and the first day of the month will be properly aligned with the day of the week for the month or months indicated by the month of the year indicia which is located in vertical columns corresponding with the columns for the years, months of the years and day of the month columns.
Claim 2
Dependent Claim
290 words
A perpetual calendar comprising a front panel having a window therein, a calendar slide supported behind the front panel in registry with the window, said slide including day of the month indicia thereon and month of the year indicia thereon located below the day of the month indicia, said indicia being observable through the window, said front panel including indicia above the window indicating the day of the week and indicia below the window indicating the year date, said slide including a tab adjacent the lower edge thereof to form a handle for moving the slide laterally of the front panel and window to align the month of the year with the year date thereby providing a calendar for that month of that year, said tab being aligned vertically with the first day of the month indicia, said front panel including a slot therein paralleling the bottom edge of the window and located adjacent thereto and above the year date indicia, said tab projecting through the slot, the bottom edge of the slot including a plurality of notches therein defining seats for the tab thereby locating and positioning the slide in adjusted position, the year indicating indicia being disposed in vertical columns, said month of the year indicia on the slide being arranged in vertical columns whereby the tab placed in one of the notches will be aligned with at least one year of the year indicia and the first day of the month will be properly aligned with the day of the week for the month or months indicated by the month of the year indicia which is located in vertical columns corresponding with the columns for the years, months of the years and day of the month columns.
Claim 3
Dependent Claim
32 words
The structure as defined in claim 1 wherein certain of the month of the year indicia and the year indicia are distinguishable in color to indicate January and February of leap years.
Claim 4
Dependent Claim
62 words
The structure as defined in claim 1 together with a back panel secured to the front panel in spaced relation thereto for capturing the slide therebetween, a support paralleling the bottom edge of the windows and disposed between the front panel and back panel for supporting the lower edge of the slide when the tab is received in one of the seats.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |