US3839857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic information displays
Assignee: Wyeth Holdings LLC
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Filing: 1971-06-03
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Granted: 1974-10-08
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Expires: 1991-06-03
Abstract
Abstract Accumulating measuring devices which indicate the flow of electric current on graduated scale. Current flow may be of any fixed rate or value, steady or pulse, and scale may be any desired graduations. Current flow is indicated by a persistent electrochromic display material which changes color due to passage of electric current through it. The entire device is electronic, with no mechanical parts. Other accumulating functions may also be measured with the device if they can be converted first to electric current. One particular application is an elapsed time indicator, e.g. a watch or clock.
Inventors
- 👤 D Berets
- 👤 G Castellion
- 👤 G Haacke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:46
CPC Classifications
G; G04; G04G; G04G9/00; G04G9/02; G04G9/06; G04G9/0023; G04G9/0029; G04G9/0035
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
An electronic timepiece comprising means to establish a stable frequency signal, means for dividing the frequency of said stable frequency signal to produce a timing pulse signal, and display control means responsive to said timing pulse signal to display an indication of the correct time, said display control means comprising persistent electrochromic display means and means to provide electric current pulses solely for activating and erasing display elements in said display means, whereby said display means continuously displays time without continuous current to said display.
Claim 2
Dependent Claim
85 words
An electronic timepiece comprising means to establish a stable frequency signal, means for dividing the frequency of said stable frequency signal to produce a timing pulse signal, and display control means responsive to said timing pulse signal to display an indication of the correct time, said display control means comprising persistent electrochromic display means and means to provide electric current pulses solely for activating and erasing display elements in said display means, whereby said display means continuously displays time without continuous current to said display.
Claim 3
Dependent Claim
140 words
An electronic timepiece comprising means to establish a stable frequency signal, means for dividing the frequency of said stable frequency signal to produce a timing pulse signal, and display control means responsive to said timing pulse signal to display an indication of the correct time, said display control means comprising persistent electrochromic display means comprising digital characters for displaying hours, minutes and seconds, wherein said display control means further comprises activating electric current pulses at the beginning of a minute to change the display to the appropriate time, and erasing pulses preceeding said activating pulses, whereby the time indication changes each minute; said display control circuit further comprising means connected to said seconds display to activate and erase said seconds display each second, and demand switch means to make and break said connection so as to indicatE seconds on demand.
Claim 4
Dependent Claim
140 words
An electronic timepiece comprising means to establish a stable frequency signal, means for dividing the frequency of said stable frequency signal to produce a timing pulse signal, and display control means responsive to said timing pulse signal to display an indication of the correct time, said display control means comprising persistent electrochromic display means comprising digital characters for displaying hours, minutes and seconds, wherein said display control means further comprises activating electric current pulses at the beginning of a minute to change the display to the appropriate time, and erasing pulses preceeding said activating pulses, whereby the time indication changes each minute; said display control circuit further comprising means connected to said seconds display to activate and erase said seconds display each second, and demand switch means to make and break said connection so as to indicatE seconds on demand.
Claim 5
Dependent Claim
13 words
The timepiece of claim 1 wherein said electrochromic display means are digital characters.
Claim 6
Dependent Claim
24 words
The timepiece of claim 1 wherein said electrochromic display means are spaced at hour and minute positions on the face of a conventional timepiece.
Claim 7
Dependent Claim
49 words
The timepiece of claim 1, wherein said display means shows hours and minutes, and said activating electric current pulses are provided at the beginning of a minute to change the display to the appropriate time, said erasing pulses preceeding said activating pulses, whereby the time indication changes each minute.
Claim 8
Dependent Claim
25 words
The timepiece of claim 5 including additional display means for seconds, and means to provide activating and erasing pulses each second to said seconds display.
Claim 9
Dependent Claim
18 words
The device of claim 1 wherein said persistent electrochromic display means comprises tungsten oxide as an electrochromic material.
Claim 10
Dependent Claim
17 words
The device of claim 5 wherein said electrochromic display means comprises tungsten oxide as an electrochromic material.
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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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |