Patent US4488158A successfully refreshed from Google Patents.
US4488158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrosensitive recording medium
Assignee: Exxon Mobil Corp
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Filing: 1983-11-02
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Granted: 1984-12-11
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Expires: 2003-11-02
Abstract
Abstract An electrosensitive recording member comprising, in combination, (1) a base support; (2) a conductive polyester layer disposed on the base support; and (3) a contrasting surface recording layer with respect to said polyester layer and combustible at the temperature developed during passage of marking current through said medium to selectively reveal the underlying contrasting polyester layer. The polyester layer is stable and not subject to depolymerization when subjected to the marking temperatures of an electronic recording member, e.g., stylus.
Inventors
- 👤 Richard C. Wirnowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:33
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/24; B41M5/245; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
86 words
An electrosensitive recording member comprising: (1) a base support; (2) a conductive polyester layer on said base support wherein said polyester is derived from (1) di- or tricarboxylic acid or anhydride, or mixtures thereof, and (2) dialcohols; and (3) a contrasting surface recording layer with respect to said polyester layer and removeable at the temperature developed during passage of marking current through said medium to selectively reveal the underlying contrasting polyester layer that does not depolymerize when subjected to said marking temperatures during the marking process.
Claim 2
Dependent Claim
86 words
An electrosensitive recording member comprising: (1) a base support; (2) a conductive polyester layer on said base support wherein said polyester is derived from (1) di- or tricarboxylic acid or anhydride, or mixtures thereof, and (2) dialcohols; and (3) a contrasting surface recording layer with respect to said polyester layer and removeable at the temperature developed during passage of marking current through said medium to selectively reveal the underlying contrasting polyester layer that does not depolymerize when subjected to said marking temperatures during the marking process.
Claim 3
Dependent Claim
13 words
The electrosensitive recording member of claim 1 wherein said base support is paper.
Claim 4
Dependent Claim
46 words
The electrosensitive recording member of claim 2 wherein said conductive polyester layer comprises a polyester in combination with conductive particles dispersed throughout said polyester, said polyester having a molecular weight between 1,500 and 12,000 and a softening point in the range of 45° to 110° C.
Claim 5
Dependent Claim
32 words
The electrosensitive recording member of claim 3 wherein said di- or tricarboxylic acid or anhydride contains from 3 to 10 carbon atoms and said dialcohol contains from 2 to 15 carbon atoms.
Claim 6
Dependent Claim
18 words
The electrosensitive recording member of claim 4 wherein said polyester is derived from propylene glycol and isophthalic acid.
Claim 7
Dependent Claim
14 words
The electrosensitive recording member of claim 5 wherein said conductive particles are carbon black.
Claim 8
Dependent Claim
23 words
The electrosensitive recording member of claim 6 comprising carbon black in an amount between 8 and 40% by weight of the polyester layer.
Claim 9
Dependent Claim
26 words
The electrosensitive recording member of claim 7 wherein said carbon black is present in an amount between 12 and 25% by weight of the polyester layer.
Claim 10
Dependent Claim
22 words
The electrosensitive recording member of claim 8 wherein said contrasting surface recording layer comprises a resin binder and white pigment dispersed therein.
Claim 11
Dependent Claim
46 words
The electrosensitive recording member of claim 8 wherein said contrasting surface recording layer comprises a resin binder and pigment dispersed through said resin binder, said pigment selected from the group consisting of zinc oxide, blanc fixe, zinc sulfide, titanium dioxide, barium sulfate, lithopone, and mixtures thereof.
Claim 12
Dependent Claim
68 words
The electrosensitive recording member of claim 2 further comprising a conductive layer disposed between said conductive polyester layer and said base support wherein the electrical conductivity of each layer of the recording member varies transversely and progressively through each adjacent layer beginning with the base support up to and including the recording layer, said recording layer exhibiting the highest electrical conductivity of the layers of the recording member.
Claim 13
Dependent Claim
14 words
The electrosensitive recording member of claim 1 wherein said base support is electrically conductive.
Claim 14
Dependent Claim
45 words
The electrosensitive recording member of claim 12 wherein said base support comprises paper, synthetic paper or a synthetic resin in combination with conductive particles dispersed throughout said base in an amount sufficient to provide a surface resistivity between 50 and 1500 ohms per square centimeter.
Claim 15
Dependent Claim
46 words
The electrosensitive recording member of claim 13 wherein said conductive polyester layer comprises a polyester in combination with conductive particles dispersed throughout said polyester, said polyester having a molecular weight between 1,500 and 12,000 and a softening point in the range of 45° to 110° C.
Claim 16
Dependent Claim
32 words
The electrosensitive recording member of claim 14 wherein said di- or tricarboxylic acid or anhydride contains from 3 to 10 carbon atoms and said dialcohol contains from 2 to 15 carbon atoms.
Claim 17
Dependent Claim
18 words
The electrosensitive recording member of claim 15 wherein said polyester is derived from propylene glycol and isophthalic acid.
Claim 18
Dependent Claim
14 words
The electrosensitive recording member of claim 16 wherein said conductive particles are carbon black.
Claim 19
Dependent Claim
23 words
The electrosensitive recording member of claim 17 comprising carbon black in an amount between 8 and 40% by weight of the polyester layer.
Claim 20
Dependent Claim
26 words
The electrosensitive recording member of claim 18 wherein said carbon black is present in an amount between 12 and 25% by weight of the polyester layer.
Claim 21
Dependent Claim
22 words
The electrosensitive recording member of claim 19 wherein said contrasting surface recording layer comprises a resin binder and white pigment dispersed therein.
Claim 22
Dependent Claim
46 words
The electrosensitive recording member of claim 20 wherein said contrasting surface recording layer comprises a resin binder and pigment dispersed through said resin binder, said pigment selected from the group consisting of zinc oxide, blanc fixe, zinc sulfide, titanium dioxide, barium sulfate, lithopone, and mixtures thereof.
References Cited (Backward Citations)
US2664044A
Cited
US3511700A
Cited
US3786518A
Cited
US4082902A
Cited
US3920873A
Cited
US4012292A
Cited
US4042936A
Cited
US4206017A
Cited
US4208467A
Cited
US4308314A
Cited
US4400706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |