Patent USRE29427E successfully refreshed from Google Patents.
USRE29427E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrorecording paper
Assignee: Panasonic Holdings Corp
•
Filing: 1976-08-30
•
Granted: 1977-10-04
•
Expires: 1996-08-30
Abstract
Abstract A recording paper having a color-developing layer containing a component capable of being colored or discolored by application of heat which has been made electroconductive by incorporation of an electro-conductive substance. When an electric current is applied to the color-developing layer, the recording paper selectively gives a visible record at a portion of the color-developing layer to which the electric current has been applied.
Inventors
- 👤 Yoichi Sekine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:27
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/20; B41M5/205
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
132 words
An electrorecording paper having a color-developing layer containing a component capable of changing color in response to applied heat, said color-developing layer comprising a heat coloring component and an electroconductive substance, both of which are dispersed in the form of fine particles in a binder; said electroconductive substance being substantially light reflective, electron conductive and having a specific resistance not greater than 10 4 Ω cm and selected from the group consisting of cuprous iodide, tin dioxide.[.,.]. .Iadd.and .Iaddend.silver-iodide.[., and antimony.].; and said color-developing layer having a .[.surfacee.]. .Iadd.surface .Iaddend.resistivity of not greater than 10 7 Ω .[.cm..]. at a temperature of 20° C. and at a relative humidity of 65%; said layer being capable of recording by changing color in response to heat applied by means of an applied electric current.
Claim 2
Dependent Claim
132 words
An electrorecording paper having a color-developing layer containing a component capable of changing color in response to applied heat, said color-developing layer comprising a heat coloring component and an electroconductive substance, both of which are dispersed in the form of fine particles in a binder; said electroconductive substance being substantially light reflective, electron conductive and having a specific resistance not greater than 10 4 Ω cm and selected from the group consisting of cuprous iodide, tin dioxide.[.,.]. .Iadd.and .Iaddend.silver-iodide.[., and antimony.].; and said color-developing layer having a .[.surfacee.]. .Iadd.surface .Iaddend.resistivity of not greater than 10 7 Ω .[.cm..]. at a temperature of 20° C. and at a relative humidity of 65%; said layer being capable of recording by changing color in response to heat applied by means of an applied electric current.
Claim 3
Dependent Claim
14 words
An electrorecording paper according to claim 1, wherein said electroconductive substance is cuprous iodide.
Claim 4
Dependent Claim
18 words
An electrorecording paper according to claim 1, wherein said color-developing layer is in contact with a supporting member.
Claim 5
Dependent Claim
46 words
A recording paper according to claim 1, wherein the component capable of being colored by application of heat is composed of a leuco body of a triphenylmethane type dye or a leuco body of a fluoran type dye and a phenolic substance or an organic acid.
Claim 6
Dependent Claim
64 words
A recording paper according to claim 1, wherein the component capable of being colored by application of heat is composed of a metal salt and an organic spot reagent, which reacts with metal ions of said salt to form a visually observable reaction product, one of said two substances which is lower in melting point having a melting point of 70° to 150° C.
Claim 7
Dependent Claim
71 words
A recording paper according to claim 1, wherein the component capable of being colored by application of heat is a redox indicator. .[.7. A recording paper according to claim 1, wherein the electroconductive substance is antimony-containing tin dioxide..]. .[.8. A recording paper according to claim 1, wherein the electroconductive substance is silica gel coated with antimony-containing tin dioxide..]. .[.9. A recording paper according to claim 1, wherein the electroconductive substance is
Claim 8
Dependent Claim
22 words
coated with a metal film..]. 10. A recording paper according to claim 3, wherein an electroconductive layer is disposed between the supporting
Claim 9
Dependent Claim
35 words
member and the color-developing layer. 11. A recording paper according to claim 10, wherein the electroconductive layer is a layer composed of a .[.support and a.]. metal, which has been deposited on the support by
Claim 10
Dependent Claim
11 words
vacuum evaporation. 12. A recording paper according to claim 10, wherein
Claim 11
Dependent Claim
34 words
the electroconductive layer is composed of cuprous iodide. 13. A recording paper according to claim 12, wherein the electroconductive layer composed of cuprous iodide .[. is a layer comprising a support and cuprous iodide,
Claim 12
Dependent Claim
33 words
which.]. has been deposited on the support by vacuum evaporation. 14. A recording paper according to claim 12, wherein the electroconductive layer composed of cuprous iodide is a layer comprising particles of cuprous
Claim 13
Dependent Claim
37 words
iodide which have been bonded by use of a binder. 15. A recording paper according to claim 10, wherein the electroconductive layer is a layer comprising carbon particles which have been bonded by use of a binder.
Claim 14
Dependent Claim
12 words
A recording paper according to claim 3, wherein the support is an
Claim 15
Dependent Claim
33 words
electroconductive material. 17. A recording paper according to claim 3, wherein a second color-developing layer formed by dispersing in a binder fine particles of a component capable of being colored by application of
Claim 16
Dependent Claim
32 words
heat is disposed between the color-developing layer and the support. 18. A recording paper according to claim 17, wherein an electroconductive layer is disposed between the second color-developing layer and the support.
References Cited (Backward Citations)
US2528005A
Cited
US3411948A
Cited
US3299433A
Cited
US3434878A
Cited
US3518038A
Cited
US3772159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |