Patent US4780356A successfully refreshed from Google Patents.
US4780356A
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Recording sheet
Assignee: AGC Inc
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Filing: 1986-09-24
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Granted: 1988-10-25
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Expires: 2006-09-24
Abstract
Abstract A recording sheet comprising a sheet of paper and porous particles provided on the paper surface, said porous particles having an average pore size of from 10 to 5000 Å, a pore volume of from 0.05 to 3.0 cc/g and an average particle size of from 0.1 to 50 μm.
Inventors
- 👤 Hiroshi Otouma
- 👤 Hitoshi Kijimuta
- 👤 Katsutoshi Misuda
- 👤 Nobuyuki Yokota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:39
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/80; D21H19/82; D21H19/822; D21H19/66; D21H19/68; D21H19/70; B; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/5218; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/249996; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/258; Y10T428/259; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
89 words
A recording sheet comprising a sheet of paper and porous particles provided on the paper surface, said porous particles having an average pore size of from 10 to 5000 Å, a pore volume of from 0.05 to 3.0 cc/g and an average particle size of from 0.1 to 50 μm, wherein the porous particles are provided on the paper surface, in the form of an overlayer formed on an intermediate layer of other particles, said intermediate layer being a layer of particles which do not substantially absorb an ink.
Claim 2
Dependent Claim
89 words
A recording sheet comprising a sheet of paper and porous particles provided on the paper surface, said porous particles having an average pore size of from 10 to 5000 Å, a pore volume of from 0.05 to 3.0 cc/g and an average particle size of from 0.1 to 50 μm, wherein the porous particles are provided on the paper surface, in the form of an overlayer formed on an intermediate layer of other particles, said intermediate layer being a layer of particles which do not substantially absorb an ink.
Claim 3
Dependent Claim
24 words
The recording sheet according to claim 1, wherein the porous particles are provided on the paper surface so that void spaces exist among them.
Claim 4
Dependent Claim
20 words
The recording sheet according to claim 2, wherein the void spaces among the particles are from 0.01 to 10 μm.
Claim 5
Dependent Claim
26 words
The recording sheet according to claim 2, wherein the volume of the void spaces among the particles is from 0.1 to 3.5 cc/g of the particles.
Claim 6
Dependent Claim
28 words
The recording sheet according to claim 1, wherein the porous particles are made of a material selected from the group consisting of silica, silica-alumina, alumina, silica-boria and silica-magnesia.
Claim 7
Dependent Claim
20 words
The recording sheet according to claim 1, wherein at least 30% by weight of the porous particles are spherical particles.
Claim 8
Dependent Claim
20 words
The recording sheet according to claim 6, wherein the spherical particles have a spherical degree of from 60 to 100.
Claim 9
Dependent Claim
30 words
The recording sheet according to claim 6, wherein among the porous particles, less than 70% of the non-spherical particles have an average particle size of from 0.1 to 20 μm.
Claim 10
Dependent Claim
28 words
The recording sheet according to claim 1, wherein the particles which do not substantially absorb an ink, have an average particle size of from 0.05 to 200 μm.
Claim 11
Dependent Claim
21 words
The recording sheet according to claim 1, wherein the intermediate layer has an apparent thickness of from 5 to 300 μm.
Claim 12
Dependent Claim
24 words
The recording sheet according to claim 1, wherein the overlayer of the porous particles has an apparent thickness of from 1 to 75 μm.
Claim 13
Dependent Claim
106 words
A recording sheet comprising a sheet of paper and porous particles provided on the paper surface, said porous particles having an average pore size of from 10 to 5000 Å a pore volume of from 0.05 to 3.0 cc/g and an average particle size of from 0.1 to 50 μm, wherein the porous particles are in the form of a layer, and a coating layer composed of particles having an average particle size smaller than the average particle size of said porous particles is formed on the surface of the layer of the porous particles so that the surface of the porous particles is made smooth.
Claim 14
Dependent Claim
106 words
A recording sheet comprising a sheet of paper and porous particles provided on the paper surface, said porous particles having an average pore size of from 10 to 5000 Å a pore volume of from 0.05 to 3.0 cc/g and an average particle size of from 0.1 to 50 μm, wherein the porous particles are in the form of a layer, and a coating layer composed of particles having an average particle size smaller than the average particle size of said porous particles is formed on the surface of the layer of the porous particles so that the surface of the porous particles is made smooth.
Claim 15
Dependent Claim
24 words
The recording sheet according to claim 12, wherein the porous particles are provided on the paper surface so that void spaces exist among them.
Claim 16
Dependent Claim
20 words
The recording sheet according to claim 13, wherein the void spaces among the particles are from 0.01 to 10 μm.
Claim 17
Dependent Claim
26 words
The recording sheet according to claim 13, wherein the volume of the void spaces among the particels is from 0.1 to 3.5 cc/g of the particles.
Claim 18
Dependent Claim
28 words
The recording sheet according to claim 12, wherein the porous particles are made of a material selected from the group consisting of silica, silica-alumina, alumina, silica-boria and silica-magnesia.
Claim 19
Dependent Claim
20 words
The recording sheet according to claim 12, wherein at least 30% by weight of the porous particles are spherical particles.
Claim 20
Dependent Claim
20 words
The recording sheet according to claim 17, wherein the spherical particles have a spherical degree of form 60 to 100.
Claim 21
Dependent Claim
30 words
The recording sheet accrding to claim 17, wherein among the porous particles, less than 70% of the non-spherical particles have an average particle size of from 0.1 to 20 μm.
Claim 22
Dependent Claim
31 words
The recording sheet according to claim 12, wherein the porous particles are provided on the paper surface in the form of an overlayer formed on an intermediate layer of other particles.
Claim 23
Dependent Claim
23 words
The recording sheet according to claim 20 wherein the intermediate layer is a layer of particles which do not substantially absorb an ink.
Claim 24
Dependent Claim
28 words
The recording sheet according to claim 21, wherein the particles which do not substantially absorb an ink, have an average particle size of from 0.05 to 200 μm.
Claim 25
Dependent Claim
21 words
The recording sheet according to claim 20 wherein the intermediate layer has an apparent thickness of from 5 to 300 μm.
Claim 26
Dependent Claim
24 words
The recording sheet according to claim 20, wherein the overlayer of the porous particles has an apparent thickness of from 1 to 75 μm.
Claim 27
Dependent Claim
61 words
The recording sheet according to claim 20 wherein the intermediate layer is composed of porous particles having an average pore size larger than the average pore size of the porous particles constituting the overlayer, and the overlapping degree of the pore sizes of the two types of the porous particles, is not higher than 30% as represented by the pore volume.
Claim 28
Dependent Claim
46 words
The recording sheet according to claim 25, wherein the porous articles constituting the intermediate layer, have an average pore size of from 0.05 to 5 μm, a pore volume of from 0.05 to 3.0 cc/g and an average particle size of from 0.1 to 50 μm.
Claim 29
Dependent Claim
21 words
The recording sheet according to claim 25, wherein the apparent thickness of the intermediate layer is from 1 to 75 μm.
Claim 30
Dependent Claim
24 words
The recording sheet according to claim 25, wherein the apparent thickness of the overlayer of the porous particles, is from 1 to 75 μm.
References Cited (Backward Citations)
US4460637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |