US4098114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording sheet
Assignee: Fujifilm Holdings Corp
•
Filing: 1977-03-28
•
Granted: 1978-07-04
•
Expires: 1997-03-28
Abstract
Abstract A recording sheet, especially useful for measuring pressures of 1 to 2,000 kg/cm 2 with a high degree of accuracy, comprising a support, a recording layer thereon, and a protective layer of a transparent synthetic resin provided on top of the recording layer by extrusion coating, the recording layer containing microcapsules having a δ/D ratio (as defined in the specification hereof) of about 1.5 × 10 -3 to about 2.5 × 10 -1 .
Inventors
- 👤 Yasuzi Asao
- 👤 Yasuhiro Ogata
- 👤 Noriyuki Hosoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:28
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/24; G01L1/247; B; B01; B01J; B01J13/00; B01J13/02; B41; B41M; B41M5/00; B41M5/124; B41M5/132; Y; Y10; Y10S; Y10S116/00; Y10S116/34; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/25
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
79 words
A recording sheet comprising a support, a recording layer thereon containing a color former and a color developer, and a protective layer of a transparent synthetic resin provided on the recording layer by extrusion coating, said recording layer containing microcapsules having a δ/D ratio of about 1.5 × 10 -3 to about 2.5 × 10 -1 , wherein δ is the number average wall thickness of the microcapsules and D is the volume average particle diameter of the microcapsules.
Claim 2
Dependent Claim
79 words
A recording sheet comprising a support, a recording layer thereon containing a color former and a color developer, and a protective layer of a transparent synthetic resin provided on the recording layer by extrusion coating, said recording layer containing microcapsules having a δ/D ratio of about 1.5 × 10 -3 to about 2.5 × 10 -1 , wherein δ is the number average wall thickness of the microcapsules and D is the volume average particle diameter of the microcapsules.
Claim 3
Dependent Claim
24 words
The recording sheet of claim 1, wherein the microcapsules have a δ/D ratio of 4 × 10 -2 to 2.5 × 10 -1 .
Claim 4
Dependent Claim
65 words
The recording sheet of claim 1, wherein when the pressure to be measured is less than about 30 Kg/cm 2 , δ/D is about 1.5 × 10 -3 to about 3.0 × 10 -2 ; and when the pressure to be measured is about 400 to about 2,000 Kg/cm 2 , δ/D is about 4 × 10 -2 to about 2.5 × 10 -1 .
Claim 5
Dependent Claim
18 words
The recording sheet of claim 1, wherein the microcapsules have a particle diameter of 0.1 to 100 microns.
Claim 6
Dependent Claim
14 words
The recording sheet of claim 1, wherein the transparent synthetic resin is a polyolefin.
Claim 7
Dependent Claim
20 words
The recording sheet of claim 1, wherein the protective layer has a thickness of about 5 to about 300 microns.
Claim 8
Dependent Claim
24 words
The recording sheet of claim 1, wherein said recording layer comprises a layer of a color former and a layer of a color developer.
Claim 9
Dependent Claim
17 words
The recording sheet of claim 1, in which the recording sheet is a pressure sensitive recording sheet.
Claim 10
Dependent Claim
15 words
The recording sheet of claim 8, in which said color former is contained in microcapsules.
Claim 11
Dependent Claim
17 words
The recording sheet of claim 1, wherein said extrusion is at about 200° to about 350° C.
Claim 12
Dependent Claim
18 words
The recording sheet of claim 1, wherein said protective layer is about 1 to about 400 microns thick.
Claim 13
Dependent Claim
18 words
The recording sheet of claim 1, wherein said protective layer is about 5 to about 300 microns thick.
Claim 14
Dependent Claim
21 words
The recording sheet of claim 1, wherein said recording layer is a single layer between said support and said protective layer.
Claim 15
Dependent Claim
30 words
The recording sheet of claim 1, wherein said recording layer is the combination of a color developer-containing layer and a color-former containing layer between said support and said protective layer.
Claim 16
Dependent Claim
143 words
In a method of pressure measurement wherein a recording sheet is maintained at the site of pressure measurement and the pressure to be measured is applied to said sheet to form color in accordance with the degree of pressure applied, and changes in optical density or in color of the resulting color are correlated with pressure to determine the pressure applied, the improvement wherein said recording sheet comprises a support, a recording layer thereon containing a color former and a color developer, and a protective layer of a transparent synthetic resin provided on the recording layer by extrusion coating, said recording layer containing microcapsules having a δ/D ratio of about 1.5 × 10 -3 to about 2.5 × 10 -1 , wherein δ is the number average wall thickness of the microcapsules and D is the volume average particle diameter of the microcapsules.
Claim 17
Dependent Claim
143 words
In a method of pressure measurement wherein a recording sheet is maintained at the site of pressure measurement and the pressure to be measured is applied to said sheet to form color in accordance with the degree of pressure applied, and changes in optical density or in color of the resulting color are correlated with pressure to determine the pressure applied, the improvement wherein said recording sheet comprises a support, a recording layer thereon containing a color former and a color developer, and a protective layer of a transparent synthetic resin provided on the recording layer by extrusion coating, said recording layer containing microcapsules having a δ/D ratio of about 1.5 × 10 -3 to about 2.5 × 10 -1 , wherein δ is the number average wall thickness of the microcapsules and D is the volume average particle diameter of the microcapsules.
Claim 18
Dependent Claim
70 words
A method of measuring pressure as called for in claim 15, wherein: when the pressure to be measured is less than about 30 Kg/cm 2 , δ/D is about 1.5 × 10 -3 to about 3.0 × 10 -2 ; and when the pressure to be measured is about 400 to about 2,000 Kg/cm 2 , δ/D is about 4 × 10 -2 to about 2.5 × 10 -1 .
Claim 19
Dependent Claim
90 words
In a method for manufacturing a recording sheet comprising a support, a recording layer thereon containing a color former and a color developer, the improvement wherein a protective layer of a transparent synthetic resin is provided on the recording layer by extrusion coating and further wherein said recording layer contains microcapsules having a δ/D ratio of about 1.5 × 10 -3 to about 2.5 × 10 -1 , wherein δ is the number average wall thickness of the microcapsules and D is the volume average particle diameter of the microcapsules.
Claim 20
Dependent Claim
90 words
In a method for manufacturing a recording sheet comprising a support, a recording layer thereon containing a color former and a color developer, the improvement wherein a protective layer of a transparent synthetic resin is provided on the recording layer by extrusion coating and further wherein said recording layer contains microcapsules having a δ/D ratio of about 1.5 × 10 -3 to about 2.5 × 10 -1 , wherein δ is the number average wall thickness of the microcapsules and D is the volume average particle diameter of the microcapsules.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |