US4244741A
Expired / Lapsed
US
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Infrared absorber
Assignee: United States Postal Service
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Filing: 1979-03-16
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Granted: 1981-01-13
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Expires: 1999-03-16
Abstract
Abstract This document discloses the use of reduced heteropoly acids as additives to absorbing material to impart reduced infrared reflectivity or transmission thereto. The reduced infrared reflectivity is especially suitable for use in inks for reading bar coded and optical character reader mail by a special sensing device wherein the infrared portion of the spectrum is betwen about 700 and 1000 nanometers. It is also useful in plastics, aqueous solutions, photographic screens, and paints.
Inventors
- 👤 Jurgen M. Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:52
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/03; C09D5/00; C09D5/32
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
42 words
An infrared absorbing composition comprising an absorbing layer material, a reduced heteropolyacid selected from the group consisting of phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid and silicotungstic acid and a solvent selected from the group consisting of water, alcohol and a glycol ether.
Claim 2
Dependent Claim
42 words
An infrared absorbing composition comprising an absorbing layer material, a reduced heteropolyacid selected from the group consisting of phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid and silicotungstic acid and a solvent selected from the group consisting of water, alcohol and a glycol ether.
Claim 3
Dependent Claim
30 words
An infrared absorbing composition of matter in accordance with claim 1 wherein said absorbing layer material is selected from the group consisting of flexographic inks, plastics, aqueous solutions, and paints.
Claim 4
Dependent Claim
43 words
An infrared absorbing ink composition of matter consisting of reduced heteropolyacids selected from the group consisting of phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid and silicotungstic acid; a flexographic ink, and a solvent selected from the group consisting of water, alcohols and glycol ethers.
Claim 5
Dependent Claim
43 words
An infrared absorbing ink composition of matter consisting of reduced heteropolyacids selected from the group consisting of phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid and silicotungstic acid; a flexographic ink, and a solvent selected from the group consisting of water, alcohols and glycol ethers.
Claim 6
Dependent Claim
18 words
An infrared absorbing ink composition of matter in accordance with claim 3 wherein said herteropolyacid is phosphomolybdic acid.
Claim 7
Dependent Claim
18 words
An infrared absorbing ink composition of matter in accordance with claim 3 wherein said heteropolyacid is phosphotungstic acid.
Claim 8
Dependent Claim
18 words
An infrared absorbing ink composition of matter in accordance with claim 3 wherein said heteropolyacid is silicomolybdic acid.
Claim 9
Dependent Claim
18 words
An infrared absorbing ink composition of matter in accordance with claim 3 wherein said heteropolyacid is silicotungstic acid.
Claim 10
Dependent Claim
16 words
An infrared ink composition of matter in accordance with claim 3 wherein said solvent is water.
Claim 11
Dependent Claim
18 words
An infrared absorbing ink composition of matter in accordance with claim 3 wherein said solvent is an alcohol.
Claim 12
Dependent Claim
19 words
An infrared absorbing ink composition of matter in accordance with claim 3 wherein said solvent is a glycol ether.
Claim 13
Independent Claim
56 words
A method of reducing infrared reflectivity in a flexographic ink which comprises incorporating therein a heteropolyacid selected from the group consisting of phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid and silicotungstic acid in a solvent selected from the group consisting of water, an alcohol and a glycol ether to which acid a reducing agent has been added.
Claim 14
Independent Claim
56 words
A method of reducing infrared reflectivity in a flexographic ink which comprises incorporating therein a heteropolyacid selected from the group consisting of phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid and silicotungstic acid in a solvent selected from the group consisting of water, an alcohol and a glycol ether to which acid a reducing agent has been added.
Claim 15
Dependent Claim
22 words
A method of reducing infrared reflectivity in a flexographic ink in accordance with claim 11 wherein said reducing agent is ascorbic acid.
Claim 16
Dependent Claim
20 words
A method of reducing reflectivity in a flexographic ink in accordance with claim 11 wherein said heteropolyacid is phosphomolybdic acid.
Claim 17
Dependent Claim
21 words
A method of reducing infrared reflectivity in a flexographic ink in accordance with claim 11 wherein said heteropolyacid is phosphotungstic acid.
Claim 18
Dependent Claim
21 words
A method of reducing infrared reflectivity in a flexographic ink in accordance with claim 11 wherein said heteropolyacid is silicomolybdic acid.
Claim 19
Dependent Claim
21 words
A method of reducing infrared reflectivity in a flexographic ink in accordance with claim 11 wherein said heteropolyacid is silicotungstic acid.
Claim 20
Dependent Claim
20 words
A method of reducing infrared reflectivity in a flexographic ink in accordance with claim 11 wherein said solvent is water.
Claim 21
Dependent Claim
21 words
A method of reducing infrared reflectivity in a flexographic ink in accordance with claim 11 wherein said solvent is an alcohol.
Claim 22
Dependent Claim
22 words
A method of reducing infrared reflectivity in a flexographic ink in accordance with claim 11 wherein said solvent is a glycol ether.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |