US3968639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic information displays
Assignee: Wyeth Holdings LLC
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Filing: 1974-07-16
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Granted: 1976-07-13
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Expires: 1994-07-16
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
- 👤 Donald Joseph Berets
- 👤 George Augustus Castellion
- 👤 Gottfried Haacke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:56
CPC Classifications
G; G04; G04G; G04G9/00; G04G9/02; G04G9/06; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155; G04G9/0023; G04G9/0029; G04G9/0035; G04G9/08; G04G9/12; G02F2001/1557
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
An electronic device for visually indicating accumulated electric current flow comprising means to establish a regulated electric current flow, and a graduated persistent electrochromic display means electrically connected to said electric current flow means, whereby said electrochromic display changes color in a continuously advancing manner as a function of said current flow, so as to indicate accumulated electric current flow.
Claim 2
Dependent Claim
60 words
An electronic device for visually indicating accumulated electric current flow comprising means to establish a regulated electric current flow, and a graduated persistent electrochromic display means electrically connected to said electric current flow means, whereby said electrochromic display changes color in a continuously advancing manner as a function of said current flow, so as to indicate accumulated electric current flow.
Claim 3
Dependent Claim
18 words
The device of claim 1 wherein said means to establish a uniform electric current flow is a battery.
Claim 4
Dependent Claim
16 words
The device of claim 2 including oscillator means to establish a uniform rate of electrical pulses.
Claim 5
Dependent Claim
11 words
The device of claim 3 including means to count said pulses.
Claim 6
Dependent Claim
16 words
The device of claim 4 wherein said persistent electrochromic display means comprises a plurality of elements.
Claim 7
Dependent Claim
22 words
The device of claim 5 including switching means coupled to said electrochromic display for activating said display elements in a prescribed manner.
Claim 8
Dependent Claim
17 words
The device of claim 6 wherein said display elements are arranged so as to indicate elapsed time.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |