US3944333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display with porous separator
Assignee: Timex Group USA Inc
•
Filing: 1975-01-13
•
Granted: 1976-03-16
•
Expires: 1995-01-13
Abstract
Abstract An electrochromic display device having transparent electrodes on a substrate and coated with electrochromic material for selectively displaying optical patterns, a counter-electrode on a parallel substrate also coated with electrochromic material, a thin porous separator membrane for closely spacing the substrates, the separator pores saturated with liquid electrolyte contacting the electrochromic layers and pigment providing a contrasting background for the first mentioned electrochromic layer and hiding the second electrochromic layer.
Inventors
- 👤 Marshall Leibowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:10
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/1533
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
In an electrochromic display of the type having a first substrate with selectively actuatable transparent electrodes and first electrochromic layers thereon, and also having a second substrate with counter-electrode and second electrochromic layer thereon, the improvement comprising: porous separator means applied as a layer and uniformly and closely spacing said first and second substrate members, the pores of said separator means being filled with liquid electrolyte, and pigment means held by said separator means and selected to provide contrast with said first electrochromic layers and disposed to hide said second electrochromic layer.
Claim 2
Dependent Claim
92 words
In an electrochromic display of the type having a first substrate with selectively actuatable transparent electrodes and first electrochromic layers thereon, and also having a second substrate with counter-electrode and second electrochromic layer thereon, the improvement comprising: porous separator means applied as a layer and uniformly and closely spacing said first and second substrate members, the pores of said separator means being filled with liquid electrolyte, and pigment means held by said separator means and selected to provide contrast with said first electrochromic layers and disposed to hide said second electrochromic layer.
Claim 3
Dependent Claim
26 words
The combination according to claim 1, wherein said separator means is a layer with thickness on the order of 25 microns applied to the first substrate.
Claim 4
Dependent Claim
27 words
The combination according to claim 1, wherein said porous separator means is a layer with thickness on the order of 25 microns applied to said second substrate.
Claim 5
Dependent Claim
14 words
The combination according to claim 1, wherein said porous separator means comprises porous polypropylene.
Claim 6
Dependent Claim
19 words
The combination according to claim 1, wherein said electrolyte comprises a mixture of titanium dioxide, and dilute sulfuric acid.
Claim 7
Dependent Claim
16 words
The combination according to claim 1, wherein said pigment means is premixed in said separator means.
Claim 8
Dependent Claim
42 words
The combination according to claim 1, wherein said pigment means is a layer of powder on one of said electrochromic layers and held in place by said separator means, the separator means having pores smaller than the particle size of said powder.
Claim 9
Dependent Claim
21 words
The combination according to claim 1, wherein said pores are of a size in the range between 0.1 and 25 microns.
Claim 10
Dependent Claim
21 words
The combination according to claim 1, wherein said pores are of a size in the range of 0.1 to 5 microns.
References Cited (Backward Citations)
US3807832A
Cited
US3844636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |