Patent US4094642A successfully refreshed from Google Patents.
US4094642A
Expired / Lapsed
US
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Indicator for ethylene oxide gas
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1977-02-15
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Granted: 1978-06-13
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Expires: 1997-02-15
Abstract
Abstract An indicator composition for ethylene oxide gas comprises 4-(4-nitrobenzyl) pyridine, nitrocellulose, a basic substance, and, optionally, a blue coloring agent. The indicator composition, when exposed to ethylene oxide gas, changes its color to develop a stable color indication, typically of a green color. The composition can take any shape and form, and is typically applied to a substrate such as paper to form a layer thereon.
Inventors
- 👤 Mitsuhiro Sumimoto
- 👤 Haruo Kohama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:12
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/26; A61L2/28; G; G01; G01N; G01N31/00; G01N31/22; G01N31/226; Y; Y10; Y10S; Y10S252/00; Y10S252/962
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
15 words
An indicator composition for ethylene oxide gas which comprises 4-(4-nitrobenzyl)-pyridine, nitrocellulose, and a basic substance.
Claim 2
Dependent Claim
15 words
An indicator composition for ethylene oxide gas which comprises 4-(4-nitrobenzyl)-pyridine, nitrocellulose, and a basic substance.
Claim 3
Dependent Claim
13 words
The indicator composition according to claim 1 which further comprises a coloring agent.
Claim 4
Dependent Claim
17 words
The indicator composition according to claim 2 in which said coloring agent is a blue coloring agent.
Claim 5
Dependent Claim
37 words
The indicator composition according to claim 1 which comprises 1 to 15 parts by weight of 4-(4-nitrobenzyl) pyridine, 12 to 25 parts by weight of nitrocellulose, and 1 to 15 parts by weight of the basic substance.
Claim 6
Dependent Claim
21 words
The indicator composition according to claim 4 which further comprises 1 to 10 parts by weight of a blue coloring agent.
Claim 7
Dependent Claim
20 words
The indicator composition according to claim 5 which further comprises 40 to 80 parts by weight of an organic solvent.
Claim 8
Dependent Claim
28 words
The indicator composition according to claim 3 in which said 4-(4-nitrobenzyl) pyridine, basic substance and blue coloring agent are encapsuled in resinous microcapsules and dispersed in said nitrocellulose.
Claim 9
Dependent Claim
47 words
An indicator composition for ethylene oxide gas which comprises 2 to 10 parts by weight of 4-(4-nitrobenzyl)-pyridine, 15 to 20 parts by weight of nitrocellulose, 2 to 10 parts by weight of a basic substance, and 1 to 10 parts by weight of a blue coloring agent.
Claim 10
Dependent Claim
47 words
An indicator composition for ethylene oxide gas which comprises 2 to 10 parts by weight of 4-(4-nitrobenzyl)-pyridine, 15 to 20 parts by weight of nitrocellulose, 2 to 10 parts by weight of a basic substance, and 1 to 10 parts by weight of a blue coloring agent.
Claim 11
Dependent Claim
53 words
The indicator composition according to claim 8 in which said basic substance is selected from the group consisting of sodium carbonate, sodium bicarbonate, sodium hydroxide, sodium oleate, sodium stearate, and calcium stearate, and said blue coloring agent is selected from the group consisting of phthalo-cyanine blue, cobalt blue, indathrene blue, and neozapon blue.
Claim 12
Dependent Claim
34 words
The indicator composition according to claim 5 which further comprises 1 to 10 parts by weight of a plasticizer selected from the group consisting of 2,2,4-trimethyl-1,3-pentanediol-dissobutylate, castor oil, acetyl tributyl citrate and ethyl citrate.
Claim 13
Dependent Claim
33 words
An indicator structure for ethylene oxide gas which comprises a substrate and a layer of indicator composition disposed on the substrate and comprising 4-(4-nitrobenzyl)-pyridine, nitrocellulose, a basic substance, and a blue coloring agent.
Claim 14
Dependent Claim
33 words
An indicator structure for ethylene oxide gas which comprises a substrate and a layer of indicator composition disposed on the substrate and comprising 4-(4-nitrobenzyl)-pyridine, nitrocellulose, a basic substance, and a blue coloring agent.
Claim 15
Dependent Claim
21 words
The indicator structure according to claim 11 which further comprises a resinous overcoating layer disposed over said layer of indicator composition.
Claim 16
Dependent Claim
24 words
The indicator structure according to claim 11 which further comprises a resinous undercoating layer interposed between said substrate and said layer of indicator composition.
Claim 17
Dependent Claim
53 words
The indicator structure according to claim 11 in which said layer of indicator composition comprises 2 to 10 parts by weight of 4-(4-nitrobenzyl)-pyridine, 15 to 20 parts by weight of nitrocellulose, 2 to 10 parts by weight of a basic substance, and 1 to 10 parts by weight of a blue coloring agent.
Claim 18
Dependent Claim
40 words
The indicator structure according to claim 12 in which said resinous overcoating layer is made of a thermoplastic resin selected from the group consisting of polyesters, polyamides, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, acrylic resins, polyvinylidene chloride, polyethylene, and polypropylene.
Claim 19
Dependent Claim
31 words
The indicator structure according to claim 12 in which said resinous overcoating layer is made of a thermosetting resin selected from the group consisting of unsaturated polyester resins and polyurethane resins.
Claim 20
Dependent Claim
31 words
The indicator structure according to claim 11 in which the quantity of the indicator composition on the substrate ranges from 1 to 20g-solid/m 2 of the area of the indicator composition.
Claim 21
Dependent Claim
26 words
The indicator structure according to claim 12 in which the quantity of the overcoating resin ranges from 1 to 20 g-solid/m 2 of the overcoating area.
Claim 22
Dependent Claim
35 words
The indicator structure according to claim 11 in which the substrate is a part of a structure for containing a product to be exposed to ethylene oxide gas to be indicated by the indicator composition.
References Cited (Backward Citations)
US3627469A
Cited
US4015937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |