US3797222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital electronic timepiece having a perpetual calendar display device
Assignee: Seiko Instruments Inc
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Filing: 1972-10-05
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Granted: 1974-03-19
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Expires: 1992-10-05
Abstract
Abstract A digital electronic timepiece having a perpetual calendar display device comprises a standard oscillator for producing a pulse signal having a frequency high enough to serve as a time reference base, a divider circuit connected to the oscillator for dividing the pulse signal into a one-second signal having a frequency of one pulse per second, a series of counters, for counting the one-second signals and developing appropriate second, minute and hour signals and applying same to a display panel for displaying the time in seconds, minutes and hours, and a perpetual calendar display device for receiving the signals from the last of the series of counters and automatically and correctly displaying the month and the date of the month. The perpetual calendar display device comprises a day counter for successively delivering a date signal on each successive day, a shift register connected to the day counter for providing an output signal corresponding to each successive month of the year, and electronic circuitry responsive to both the date signals and the signals from the shift register to automatically reset the day counter to commence counting at the first day and to shift the register to the proper month. A display panel receives the date signals from the day counter and the month signals from the register and displays the correct month and date of the month.
Inventors
- 👤 T Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:55
CPC Classifications
G; G04; G04G; G04G9/00; G04G9/0082; G04G9/0094; G04G9/02; G04G9/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
In an electronic timepiece having means for displaying the time in minutes and hours: means for continuously generating a succession of electric signals at a rate of one signal per day; and date display means receptive of said succession of signals for numerically displaying during each successive day the correct date of the month in numerical form, said date display means comprising resettable counting means receptive of said succession of electric signals for counting same and delivering a corresponding succession of electric date signals in successive groups corresponding respectively to the months of a year with each group containing therein from 28 to 31 date signals corresponding respectively to the different dates in a month and operative in response to an electric reset signal to begin a new group, electric circuit means responsive to the date signals for developing said reset signal and applying same to said resettable counting means after the last date of each month to effect resetting of said resettable counting means and including means for driving said resettable counting means through 31 states corresponding to the 31 possible date signals during those months containing less than 31 dates and then developing said reset signal, and a date display section responsive to each group of date signals for successively diSplaying the dates of each month of each year.
Claim 2
Dependent Claim
221 words
In an electronic timepiece having means for displaying the time in minutes and hours: means for continuously generating a succession of electric signals at a rate of one signal per day; and date display means receptive of said succession of signals for numerically displaying during each successive day the correct date of the month in numerical form, said date display means comprising resettable counting means receptive of said succession of electric signals for counting same and delivering a corresponding succession of electric date signals in successive groups corresponding respectively to the months of a year with each group containing therein from 28 to 31 date signals corresponding respectively to the different dates in a month and operative in response to an electric reset signal to begin a new group, electric circuit means responsive to the date signals for developing said reset signal and applying same to said resettable counting means after the last date of each month to effect resetting of said resettable counting means and including means for driving said resettable counting means through 31 states corresponding to the 31 possible date signals during those months containing less than 31 dates and then developing said reset signal, and a date display section responsive to each group of date signals for successively diSplaying the dates of each month of each year.
Claim 3
Dependent Claim
46 words
An electronic timepiece according to claim 1; wherein said electric circuit means includes leap year counting means for developing an electric leap year signal every 4 years, and means responsive to said leap year signal for developing said reset signal on the 29th day of February.
Claim 4
Dependent Claim
64 words
An electronic timepiece according to claim 1; including month display means responsive to a succession of month signals for displaying the correct month; and wherein said electric circuit means includes means for repeatedly developing a succession of month signals corresponding respectively to the 12 months of the year and successively applying same to said month display means at the first day of each month.
Claim 5
Dependent Claim
33 words
An electronic timepiece according to claim 3; wherein said means for repeatedly developing a succession of month signal includes a shift register having 12 states corresponding to the 12 months of a year.
Claim 6
Dependent Claim
127 words
An electronic timepiece according to claim 1; wherein said means for driving said resettable counting means through 31 states comprises an AND gate having blocking and gating states and having an input side connected to receive the last date signal delivered by said resettable counting means in each group of date signals which contains from 28 to 30 date signals and connected to receive a series of high frequency clock pulses and having an output side connected to said resettable counting means for applying clock pulses thereto when said AND gate is in said gating state to drive same whereby the clock pulses rapidly drive said resettable counting means through said 31 states to reset same at the end of those months having 28 to 30 days.
Claim 7
Dependent Claim
114 words
An electronic timepiece according to claim 5; wherein said means for driving said resettable counting means through 31 states includes a 12-bit shift register operative to develop a separate electric month signal during each month, and means connecting said shift register to said AND gate to apply only those electric month signals corresponding to months having a maximum of from 28 to 30 days to said input side of said AND gate to effect shifting of said AND gate from said gating state to said blocking state only when said last date signals and said electric month signals corresponding to months having a maximum of from 28 to 30 days are simultaneously applied thereto.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |