Patent US2808308A successfully refreshed from Google Patents.
Patent US4476179A successfully refreshed from Google Patents.
US4476179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink donor sheet
Assignee: Fujifilm Business Innovation Corp
•
Filing: 1982-08-30
•
Granted: 1984-10-09
•
Expires: 2002-08-30
Abstract
Abstract An ink donor sheet comprising a porous sheet and a heat-fusible ink layer formed on it is disclosed. The ink layer has such temperature-dependent gradation characteristics that it remains solid at ordinary temperatures and when it is heated to a certain temperature its viscosity is suddenly decreased and upon further heating, the viscosity is decreased gradually. The ink donor sheet is capable of producing halftones in the images it creates.
Inventors
- 👤 Haruhiko Moriguchi
- 👤 Toshiharu Inui
- 👤 Takashi Ohmori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:12
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/38207; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/249996
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
An ink donor sheet for transferring an image onto an adjacent recording sheet: wherein the ink donor sheet has a maximum recording density and application of thermal energy beyond the point of maximum recording density results in an image of decreased density and comprises: a porous base sheet; and an ink layer on the porous base sheet, the ink layer comprising a binder, a coloring agent and a softening agent and being characterized by a temperature-dependent gradation such that it remains solid at ordinary temperatures, undergoes a sudden decrease in viscosity when heated to a certain temperature to transfer an image to the recording sheet, and undergoes a further gradual decrease in viscosity upon further heating to transfer an image of decreased density to the recording sheet, said ink donor sheet being capable of halftone reproduction.
Claim 2
Dependent Claim
136 words
An ink donor sheet for transferring an image onto an adjacent recording sheet: wherein the ink donor sheet has a maximum recording density and application of thermal energy beyond the point of maximum recording density results in an image of decreased density and comprises: a porous base sheet; and an ink layer on the porous base sheet, the ink layer comprising a binder, a coloring agent and a softening agent and being characterized by a temperature-dependent gradation such that it remains solid at ordinary temperatures, undergoes a sudden decrease in viscosity when heated to a certain temperature to transfer an image to the recording sheet, and undergoes a further gradual decrease in viscosity upon further heating to transfer an image of decreased density to the recording sheet, said ink donor sheet being capable of halftone reproduction.
Claim 3
Dependent Claim
27 words
An ink donor sheet as claimed in claim 1, wherein the porous base sheet is Japanese tissue paper having a thickness of about 5 to 20 μm.
Claim 4
Dependent Claim
39 words
An ink donor sheet as claimed in claim 1 or 2, wherein the porous base sheet has pores 1 to 100 μm in size, the pores being positioned on 20 to 80% of the area of the base sheet.
Claim 5
Dependent Claim
36 words
An ink donor sheet as claimed in claim 3, wherein the porous base sheet has pores 5 to 20 μm in size, the pores being positioned 50 to 70% of the area of the base sheet.
Claim 6
Dependent Claim
22 words
An ink donor sheet as claimed in claim 2, wherein the ink layer has a thickness of from 2 to 12 μm.
Claim 7
Dependent Claim
22 words
An ink donor sheet as claimed in claim 1, wherein the ink layer has a thickness of from 2 to 12 μm.
Claim 8
Dependent Claim
67 words
An ink donor sheet as claimed in claim 1, wherein the porous base sheet is Japanese tissue paper having a thickness of about 5 to 20 μm, the porous base sheet has pores 1 to 100 μm in size, the pores being positioned on 20 to 80% of the area of the base sheet, and the ink layer has a thickness of from 2 to 12 μm.
References Cited (Backward Citations)
JPS533242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |