US5547501A
Expired / Lapsed
US
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Method for formation of invisible marking and method for reading of invisible marking
Assignee: Kansai Paint Co Ltd
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Filing: 1995-05-05
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Granted: 1996-08-20
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Expires: 2015-05-05
Abstract
Abstract Information is printed on the surface of a substrate with a marking ink containing a mixture of an indium-tin mixed oxide and at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate, to prepare an invisible marking-printed material; and infrared rays of 2-10 μm wavelength are applied onto the invisible marking-printed material to measure the infrared absorptivities of the invisible marking area and other area of said material and identify the information signified by the invisible marking.
Inventors
- 👤 Tsutomu Maruyama
- 👤 Atsushi Akiyama
- 👤 Kazuo Sanada
- 👤 Sadao Chigira
- 👤 Masanobu Hidaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:15
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50; G; G06; G06K; G06K19/00; G06K19/06; G06K19/06009; G06K7/00; G06K7/10; G06K7/12; Y; Y10; Y10S; Y10S260/00; Y10S260/38
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
48 words
A method for formation of invisible marking, which comprises printing information on the surface of a substrate with a marking ink containing a mixture of an indium-tin mixed oxide and at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate.
Claim 2
Independent Claim
48 words
A method for formation of invisible marking, which comprises printing information on the surface of a substrate with a marking ink containing a mixture of an indium-tin mixed oxide and at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate.
Claim 3
Dependent Claim
27 words
The method set forth in claim 1, wherein the indium-tin mixed oxide consists of 5-95% by weight of indium oxide and 95-5% by weight of tin oxide.
Claim 4
Dependent Claim
27 words
The method set forth in claim 1, wherein the indium-tin mixed oxide consists of 40-90% by weight of indium oxide and 60-10% by weight of tin oxide.
Claim 5
Dependent Claim
49 words
The method set forth in claim 1, wherein the marking ink contains the at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate, in an amount of 10-400 parts by weight per 100 parts by weight of the indium-tin mixed oxide.
Claim 6
Dependent Claim
49 words
The method set forth in claim 1, wherein the marking ink contains the at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate, in an amount of 30-300 parts by weight per 100 parts by weight of the indium-tin mixed oxide.
Claim 7
Dependent Claim
20 words
The method set forth in claim 1, wherein the indium-tin mixed oxide has an average particle diameter of 0.001-0.5 μm.
Claim 8
Dependent Claim
19 words
The method set forth in claim 1, wherein the marking ink further contains a coating resin as the vehicle.
Claim 9
Dependent Claim
58 words
The method set forth in claim 7, wherein the marking ink contains the mixture of an indium-tin mixed oxide and at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate, in an amount of 50-1,000 parts by weight per 100 parts by weight (as solid content) of the coating resin.
Claim 10
Dependent Claim
25 words
The method set forth in claim 1, wherein the substrate surface reflects 20% or more of the infrared rays of 2-10 μm wavelength applied thereon.
Claim 11
Dependent Claim
30 words
The method set forth in claim 1, wherein the printing of information with the marking ink is conducted by gravure coating, silk screen printing, offset printing or ink jet printing.
Claim 12
Dependent Claim
27 words
The method set forth in claim 1, wherein the printing of the information with the marking ink is conducted in a dry film thickness of 0.5-10 μm.
Claim 13
Dependent Claim
24 words
The method set forth in claim 1, which further comprises coating a clear coating on at least the marking ink area of the substrate.
Claim 14
Dependent Claim
21 words
The method set forth in claim 12, wherein the clear coating is coated in a dry film thickness of 1-20 μm.
Claim 15
Dependent Claim
24 words
The method set forth in claim 1, which further comprises coating a coloring ink on at least the marking ink area of the substrate.
Claim 16
Dependent Claim
21 words
The method set forth in claim 14, wherein the coloring ink is coated in a dry film thickness of 0.5-20 μm.
Claim 17
Dependent Claim
56 words
A met hod for reading of invisible marking, which comprises applying infrared rays of 2-10 μm wavelength onto an invisible marking-printed material obtained by the method of any of claims 1-15, to measure the infrared absorptivities of the invisible marking area and other area of said material and identify the information signified by the invisible marking.
Claim 18
Dependent Claim
27 words
The method set forth in claim 16, wherein the measurement of the infrared absorptivities is conducted by the use of an infrared detector or an infrared camera.
Claim 19
Dependent Claim
30 words
A marking ink containing a mixture of an indium-tin mixed oxide and at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate.
Claim 20
Dependent Claim
30 words
A marking ink containing a mixture of an indium-tin mixed oxide and at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate.
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) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |