Patent US4669891A successfully refreshed from Google Patents.
US4669891A
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US
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Area code twilight clock
Assignee: Individual
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Filing: 1986-06-19
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Granted: 1987-06-02
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Expires: 2006-06-19
Abstract
Abstract The assembly includes a keyboard (16) for operator selection of the area code or airport designation of a geographical location. A memory means (20) contains information of sunrise time, sunset time and twilight duration for each area code or airport designation selected. A counter means (30) updates and stores codes representative of the time and date. A demultiplexer (47), registers (44) and a register counter (49) accumulates the data from the keyboard and from the months (48) and days (42) counters to be sent to the memory means (20) to be decoded for selection of the necessary information. A program control (50), such as a microprocessor, accumulates the data from the memory means (20) and counter means (30) to generate a signal to and present on the video display screen (12) parallel vertical sections (60, 62, 64) representing juxtaposed hours of the day at the selected geographical location including each of light, dark and twilight hours.
Inventors
- 👤 John M. Rosevear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:11
CPC Classifications
G; G04; G04G; G04G9/00; G04G9/0082; G04G9/0094; G04G9/0076
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
104 words
An display system for displaying the daylight conditions of a geographical location, comprising; a display screen (12), memory means (20) storing information including the beginning and ending of twilight at sunrise and sunset for each calendar day of the year for various geographical locations, and control means (22) for selecting a geographical location and retrieving the information from said memory means (20) and for generating a signal to and presenting on said display screen (12) parallel sections (60, 62, 64) of different light intensities representing juxtaposed hours of the day at the selected geographical location including each of light and dark and twilight hours.
Claim 2
Dependent Claim
104 words
An display system for displaying the daylight conditions of a geographical location, comprising; a display screen (12), memory means (20) storing information including the beginning and ending of twilight at sunrise and sunset for each calendar day of the year for various geographical locations, and control means (22) for selecting a geographical location and retrieving the information from said memory means (20) and for generating a signal to and presenting on said display screen (12) parallel sections (60, 62, 64) of different light intensities representing juxtaposed hours of the day at the selected geographical location including each of light and dark and twilight hours.
Claim 3
Dependent Claim
21 words
A system as set forth in claim 1 wherein said system is electronic and said display screen comprises a video screen.
Claim 4
Dependent Claim
27 words
A system as set forth in claim 2 wherein said memory means (20) includes a first memory block (24) containing sunrise time, sunset time, and twilight duration.
Claim 5
Dependent Claim
36 words
A system as set forth in claim 3 wherein said control means (22) includes a keyboard (16) for manual input of the geographical location for display of respective said sections of light, dark and twilight hours.
Claim 6
Dependent Claim
38 words
A system as set forth in claim 4 including a clock pulse generator (32) and wherein said control means (22) includes counter means (30) for storing real time by receiving the signal from a clock pulse generator (32).
Claim 7
Dependent Claim
46 words
A system as set forth in claim 5 wherein said counter means (30) includes a plurality of separate but electronically connected binary counters (36, 38, 40, 42, 48) for storing and updating a number representing the present time in seconds, minutes, hours, days, and months respectively.
Claim 8
Dependent Claim
91 words
A system as set forth in claim 6 wherein said control means (22) includes a demultiplexer (47), holding registers (44), and a register counter (49) for retrieving signals in response to the input of geographical location by said keyboard (16) and from said counters (42) and (48) for said days and said months and for providing an output to said memory means (20) wherein said memory means decodes the signal to designate the location where the representative information of said sunrise time, said sunset time, and said twilight duration is located.
Claim 9
Dependent Claim
68 words
A system as set forth in claim 7 wherein said control means (22) includes a program control (50) which retrieves the signal of information from said memory means (20), from said counters (38, 40) for said minutes and said hours and generates a signal to said display screen for the display of said sections of light (60), dark (62) and twilight (64) hours with respect to present time.
Claim 10
Dependent Claim
42 words
A system as set forth in claim 8 wherein said memory means (20) includes a second memory block (26) containing by letter the city name beginning with the letter and telephone area codes corresponding to the geographical location of said city name.
Claim 11
Dependent Claim
35 words
A system as set forth in claim 9 wherein said memory means (20) includes a third memory block (28) containing by geographical location represented by telephone area code minor city names within said area code.
Claim 12
Dependent Claim
21 words
A system as set forth in claim 10 wherein said memory means (20) includes at least one Read-Only Memory unit (ROM).
Claim 13
Dependent Claim
72 words
A system as set forth in claim 11 wherein said control means (22) further includes a comparator (46) electronically connected between the output of said memory means (20) and the output of said days counter (42) for clearing said days counter (42) when the number from said days counter equals the output of said memory means (20) which represents the total number of days in a particular month of any designated year.
Claim 14
Dependent Claim
18 words
A system as set forth in claim 12 wherein said display screen is a cathode ray tube screen.
Claim 15
Independent Claim
95 words
A method for displaying the daylight of a geographical location the steps comprising; storing information of the beginning and ending of the twilight times at sunrise and sunset for each calendar day of the year for various geographical locations in a memory means, selecting a geographical location, retrieving the information from the memory means corresponding to the selected geographical location, and presenting the information on a display screen in parallel sections of different light intensities representing juxtaposed hours of the day at the selected geographical location including each of light and dark and twilight hours.
Claim 16
Independent Claim
95 words
A method for displaying the daylight of a geographical location the steps comprising; storing information of the beginning and ending of the twilight times at sunrise and sunset for each calendar day of the year for various geographical locations in a memory means, selecting a geographical location, retrieving the information from the memory means corresponding to the selected geographical location, and presenting the information on a display screen in parallel sections of different light intensities representing juxtaposed hours of the day at the selected geographical location including each of light and dark and twilight hours.
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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |