US3773542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensitizing sheet for pressure- or heat-sensitive copying paper
Assignee: Fujifilm Holdings Corp
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Filing: 1971-04-28
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Granted: 1973-11-20
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Expires: 1991-04-28
Abstract
Abstract A sensitizing sheet capable of forming a distinct color when contacted with a substantially colorless color former comprising a support having thereon a layer containing a phenol resin and an alkaline material is disclosed.
Inventors
- 👤 T Hayashi
- 👤 H Matsukawa
- 👤 S Katayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:50
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
A pressure sensitive copying assembly comprising a support having thereon a layer of a substantially colorless color forming, election donating, organic compound, and a sensitizing layer for said color former for use therewith for color formation, comprising an oil soluble acidic phenol resin and an alkali material selected from the group consisting of sodium hydroxide and potassium hydroxide whereby color formation occurs upon pressurization of said assembly and the contacting of said color former and said sensitizing layer.
Claim 2
Dependent Claim
29 words
The pressure sensitive copying assembly of claim 1, wherein said sensitizing layer comprises a layer of said oil soluble acidic phenol resin and a layer of said alkali material.
Claim 3
Dependent Claim
29 words
The pressure sensitive copying assembly of claim 2, wherein said sensitizing layer comprises a layer of said oil soluble acidic phenol resin and a layer of said alkali material.
Claim 4
Dependent Claim
29 words
The pressure sensitive copying assembly of claim 3, wherein at least one of said oil soluble phenol resin layer or said alkali material layer additionally contains an adsorbent substance.
Claim 5
Dependent Claim
29 words
The pressure sensitive copying assembly of claim 2, wherein at least one of said oil soluble phenol resin layer or said alkali material layer additionally contains an adsorbent substance.
Claim 6
Dependent Claim
24 words
The pressure sensitive copying assembly of claim 5, wherein said adsorbent substance is a color-forming substance when contacted with said substantially colorless color former.
Claim 7
Dependent Claim
26 words
The pressure sensitive copying assembly of claim 5, wherein said adsorbent substance is a substantially non-color forming substance when contacted with said substantially colorless color former.
Claim 8
Dependent Claim
24 words
The pressure sensitive copying assembly of claim 6, wherein said adsorbent substance is a color-forming substance when contacted with said substantially colorless color former.
Claim 9
Dependent Claim
26 words
The pressure sensitive copying assembly of claim 6, wherein said adsorbent substance is a substantially non-color forming substance when contacted with said substantially colorless color former.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |