Patent US4142890A successfully refreshed from Google Patents.
US4142890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive trans-epindolidione pigment for migration imaging processes
Assignee: Eastman Kodak Co
•
Filing: 1977-12-05
•
Granted: 1979-03-06
•
Expires: 1997-12-05
Abstract
Abstract Trans-epindolidione is a useful yellow material in forming photoelectrophoretic migration images.
Inventors
- 👤 Melvin S. Bloom
- 👤 Michael T. Regan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:18
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
61 words
A migration imaging process which comprises subjecting electrically photosensitive colorant particles positioned between at least two electrodes to an applied electric field and exposing said material to an image pattern of radiation to which the material is photosensitive, thereby obtaining image formation on at least one of said electrodes, characterized in that at least a portion of said particles is trans-epindolidione.
Claim 2
Dependent Claim
61 words
A migration imaging process which comprises subjecting electrically photosensitive colorant particles positioned between at least two electrodes to an applied electric field and exposing said material to an image pattern of radiation to which the material is photosensitive, thereby obtaining image formation on at least one of said electrodes, characterized in that at least a portion of said particles is trans-epindolidione.
Claim 3
Dependent Claim
76 words
A photoelectrophoretic migration imaging process which comprises subjecting an electrically insulating carrier material positioned between at least two electrodes to an applied electric field and exposing said carrier material to an image pattern of radiation, said carrier material containing electrically photosensitive particles which comprise at least one colorant component photosensitive to said radiation, thereby obtaining image formation on at least one of said electrodes, characterized in that at least a portion of said particles is trans-epindolidione.
Claim 4
Dependent Claim
76 words
A photoelectrophoretic migration imaging process which comprises subjecting an electrically insulating carrier material positioned between at least two electrodes to an applied electric field and exposing said carrier material to an image pattern of radiation, said carrier material containing electrically photosensitive particles which comprise at least one colorant component photosensitive to said radiation, thereby obtaining image formation on at least one of said electrodes, characterized in that at least a portion of said particles is trans-epindolidione.
Claim 5
Dependent Claim
13 words
A process according to claim 2 wherein said carrier material is a liquid.
Claim 6
Dependent Claim
80 words
A photoelectrophoretic migration imaging process which comprises subjecting an electrically insulating carrier material positioned between at least two electrodes to an applied electric field and exposing said carrier material to an image pattern of radiation, said carrier material containing electrically photosensitive particles which comprise at least three different color components photosensitive to said radiation thereby obtaining polychrome image formation on at least one of said electrodes characterized in that at least a portion of said electrically photosensitive particles is trans-epindolidione.
Claim 7
Dependent Claim
80 words
A photoelectrophoretic migration imaging process which comprises subjecting an electrically insulating carrier material positioned between at least two electrodes to an applied electric field and exposing said carrier material to an image pattern of radiation, said carrier material containing electrically photosensitive particles which comprise at least three different color components photosensitive to said radiation thereby obtaining polychrome image formation on at least one of said electrodes characterized in that at least a portion of said electrically photosensitive particles is trans-epindolidione.
Claim 8
Dependent Claim
14 words
A migration imaging process according to claim 4, wherein said carrier is a liquid.
Claim 9
Dependent Claim
24 words
A migration imaging dispersion comprising a carrier and electrically photosensitive colorant particles characterized in that at least a portion of said particles is trans-epindolidione.
Claim 10
Dependent Claim
24 words
A migration imaging dispersion comprising a carrier and electrically photosensitive colorant particles characterized in that at least a portion of said particles is trans-epindolidione.
Claim 11
Dependent Claim
13 words
A dispersion according to claim 2 wherein said carrier material is a liquid.
Claim 12
Dependent Claim
38 words
A photoelectrophoretic migration imaging dispersion for polychrome imaging comprising a carrier material and electrically photosensitive particles which comprise at least three different color components characterized in that at least a portion of said electrically photosensitive particles is trans-epindolidione.
Claim 13
Dependent Claim
38 words
A photoelectrophoretic migration imaging dispersion for polychrome imaging comprising a carrier material and electrically photosensitive particles which comprise at least three different color components characterized in that at least a portion of said electrically photosensitive particles is trans-epindolidione.
Claim 14
Dependent Claim
12 words
A dispersion according to claim 8 wherein said carrier is a liquid.
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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |