Patent US3865295A successfully refreshed from Google Patents.
Patent US4889603A successfully refreshed from Google Patents.
US4889603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of eliminating gas bubbles in an electrophoretic display
Assignee: AUO Corp
•
Filing: 1988-12-09
•
Granted: 1989-12-26
•
Expires: 2008-12-09
Abstract
Abstract There is disclosed a method which minimizes bubble growth during electrophoretic cell operation. The method involves exposing the electrophoretic suspension to an ultrasonic probe at a given frequency and amplitude and for a suitable time period just prior to pouring the suspension into the electrophoretic display. Exposure to the ultrasonic probe minimizes bubble growth during actual cell operation as the probe operates to drive out a significant amount of gas contained in the suspension while further affecting the pigment particle characteristics.
Inventors
- 👤 Frank J. DiSanto
- 👤 Denis A. Krusos
- 👤 Frederic E. Schubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:52
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/165; G02F1/166; G02F1/167; G02F1/1675; G02F1/1679
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A method of eliminating gas bubble formation in an electrophoretic display of the type containing an electrophoretic dispersion including pigment particles suspended in a suitable solution, comprising the step of: agitating said dispersion at a given frequency rate to cause captured gas bubbles to migrate from said dispersion prior to placing said dispersion into said display said given frequency rate being at a frequency of 40 KHZ with a 1000 Watt ultrasonic probe and for a duration between 1-1.5 minutes.
Claim 2
Independent Claim
80 words
A method of eliminating gas bubble formation in an electrophoretic display of the type containing an electrophoretic dispersion including pigment particles suspended in a suitable solution, comprising the step of: agitating said dispersion at a given frequency rate to cause captured gas bubbles to migrate from said dispersion prior to placing said dispersion into said display said given frequency rate being at a frequency of 40 KHZ with a 1000 Watt ultrasonic probe and for a duration between 1-1.5 minutes.
Claim 3
Dependent Claim
11 words
The method according to claim 1 wherein said solution contains tetrachloroethylene.
Claim 4
Dependent Claim
12 words
The method according to claim 1 wherein said solvent contains butyl benzene.
Claim 5
Dependent Claim
26 words
The method according to claim 1 wherein said pigment particles are submicron particles of a pigment selected from one having a yellow, white or black coloration.
Claim 6
Dependent Claim
14 words
The method according to claim 1 wherein said gas bubbles are mainly air bubbles.
Claim 7
Dependent Claim
19 words
The method according to claim 1 wherein said pigment particles are coated with a charge control and wetting agent.
Claim 8
Dependent Claim
16 words
The method according to claim 2 wherein said solution contains at least 80% concentration of tetrachloroethylene.
Claim 9
Dependent Claim
14 words
The method according to claim 7 wherein said solution contains between 1-10% pigment particles.
Claim 10
Dependent Claim
16 words
The method according to claim 8 wherein said solution contains about 10% of titanium dioxide pigment.
Claim 11
Dependent Claim
17 words
The method according to claim 8 wherein said solution contains about 4% of a yellow colored pigment.
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) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |