US3767449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording sheet
Assignee: Fujifilm Holdings Corp
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Filing: 1971-09-28
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Granted: 1973-10-23
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Expires: 1991-09-28
Abstract
Abstract A recording sheet comprising a support having coated thereon a layer of a color developer which is capable of forming a distinct color when contacted with a color former. The color developer contains a combination of (i) a polymer of an aromatic carboxylic acid having at least one hydroxyl group with an aldehyde or acetylene and (ii) a metallic compound.
Inventors
- 👤 T Hayashi
- 👤 H Kato
- 👤 A Miyamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/258; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
23 words
The recording sheet of claim 1 wherein said polymer is salicylic acid-aldehyde polymer, p-hydroxybenzoic acid-aldehyde polymer, 2,6-dihydroxybenzoic acid-aldehyde polymer or salicylic acid-acetylene polymer.
Claim 2
Dependent Claim
28 words
A recording sheet of claim 1 wherein said metal is selected from the group consisting of metals of groups IIa, IIb, IIIa and IVa of the Periodic Table.
Claim 3
Dependent Claim
14 words
The recording sheet of claim 1 wherein said color developer further contains a pigment.
Claim 4
Dependent Claim
62 words
The recording sheet of claim 1 wherein said metallic compound is selected from the group consisting of zinc oxide, cadmium oxide, magnesium oxide, zinc hydroxide, magnesium hydroxide, calcium hydroxide, zinc carbonate, calcium carbonate and magnesium carbonate and wherein said metallic compound is in the form of fine particles thereof having a size which will pass a sieve of more than 325 mesh.
Claim 5
Dependent Claim
30 words
The recording sheet of claim 1, wherein the amount of said polymer is from 10 to 30 parts by weight based on 100 parts by weight of said metallic compound.
Claim 6
Dependent Claim
32 words
The recording sheet of claim 6 wherein said color developer further consists essentially of at least one part by weight, based on 100 parts by weight of said polymer, of a pigment.
Claim 7
Dependent Claim
28 words
The recording sheet of claim 7 wherein the amount of said pigment is from 10 to 500 parts by weight per 100 parts by weight of said polymer.
Claim 8
Dependent Claim
18 words
The recording sheet of claim 1 wherein said color developer layer further consists essentially of a binder therefor.
Claim 9
Dependent Claim
27 words
The recording sheet of claim 1 wherein said color developer layer is coated onto said support in an amount of greater than 0.1 gram per square meter.
Claim 10
Dependent Claim
28 words
The recording sheet of claim 1 wherein said color developer layer is coated onto said support in an amount of from 0.5 to 10 grams per square meter.
Claim 11
Dependent Claim
41 words
The recording sheet of claim 1 further consisting essentially of an alkali metal salt of an organic acid or an alkali compound in an amount of from 0.01 to 1 part by weight per 1 part by weight of said polymer.
Claim 12
Dependent Claim
26 words
The recording sheet of claim 1 wherein said color former is coated on the same side of said support as said layer of said color developer.
Claim 13
Dependent Claim
26 words
The recording sheet of claim 1 wherein said color former is coated on the opposite side of said support from said layer of said color developer.
Claim 14
Dependent Claim
31 words
The recording sheet of claim 1 wherein said color former is coated onto a second support which is separate from said support having coated thereon said layer of said color developer.
References Cited (Backward Citations)
US3540914A
Cited
US3682680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |