US4521376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glutaraldehyde indicator
Assignee: Pymah Corp
•
Filing: 1983-06-13
•
Granted: 1985-06-04
•
Expires: 2003-06-13
Abstract
Abstract An indicator capable of determining whether the concentration of a disinfectant/sterilant solution of glutaraldehyde exceeds a predetermined value comprising an indicator medium impregnated with a sulfite compound and an amino acid or an ammonium salt.
Inventors
- 👤 Robert J. Witonsky
- 👤 Raymond P. Larsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:58
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/226; Y; Y10; Y10S; Y10S435/00; Y10S435/805; Y10T; Y10T436/00; Y10T436/20; Y10T436/200833
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
75 words
An indicator capable of distinguishing between glutaraldehyde sterilant solutions of different glutaraldehyde concentrations, comprising an absorbant medium which has been impregnated with a solution of a sulfite compound and amine compound wherein the amine compound is (1) an amino acid where the amino acid is glycine or lysine; or (2) an ammonium compound and wherein said sulfite and amine compounds are present in an amount effective to distinguish between glutaraldehyde solutions of different glutaraldehyde concentrations.
Claim 2
Dependent Claim
75 words
An indicator capable of distinguishing between glutaraldehyde sterilant solutions of different glutaraldehyde concentrations, comprising an absorbant medium which has been impregnated with a solution of a sulfite compound and amine compound wherein the amine compound is (1) an amino acid where the amino acid is glycine or lysine; or (2) an ammonium compound and wherein said sulfite and amine compounds are present in an amount effective to distinguish between glutaraldehyde solutions of different glutaraldehyde concentrations.
Claim 3
Dependent Claim
12 words
The indicator according to claim 1 wherein the absorbant medium is paper.
Claim 4
Dependent Claim
47 words
The indicator according to claim 1 wherein the sulfite/amino acid mixture is deposited by impregnating the absorbant medium with a solution of sulfite and amino acid wherein the molar ratio of the concentration of sulfite to amine compound in the solution is about 2.5/1 to about 20/1.
Claim 5
Dependent Claim
15 words
The indicator according to claim 1 wherein the sulfite compound is an alkali metal sulfite.
Claim 6
Dependent Claim
13 words
The indicator according to claim 4 wherein the sulfite compound is sodium sulfite.
Claim 7
Dependent Claim
16 words
The indicator according to claim 1 wherein the absorbant medium comprises a strip of absorbant material.
Claim 8
Dependent Claim
16 words
The indicator according to claim 6 wherein the absorbant medium is chromotography paper or filter paper.
Claim 9
Dependent Claim
14 words
The indicator according to claim 1 wherein the amine compound is an ammonium compound.
Claim 10
Dependent Claim
22 words
The indicator according to claim 8 wherein the ammonium compound is ammonium chloride, ammonium bromide, ammonium bicarbonate, ammonium acetate, or ammonium formate.
Claim 11
Dependent Claim
22 words
The indicator according to claim 1 wherein the concentration of amino acid on the absorbant medium is about 0.1M to about 0.3M.
Claim 12
Dependent Claim
22 words
The indicator according to claim 10 wherein the concentration of amino acid on the absorbant medium is about 0.15M to about 0.25M.
Claim 13
Dependent Claim
13 words
The indicator according to claim 11 wherein the amino acid concentration is 0.2M.
Claim 14
Dependent Claim
33 words
The indicator according to claim 1 wherein the sulfite compound is sodium sulfite, the amino acid is glycine, the absorbant medium is chromotography paper and the paper is mounted on a backing strip.
Claim 15
Dependent Claim
14 words
The indicator according to claim 13 wherein the backing strip is a surlyn/mylar laminate.
Claim 16
Dependent Claim
34 words
The indicator according to claim 14 wherein the absorbant medium comprises chromotography paper heat bonded to a surlyn layer of a surlyn/mylar laminate, and the absorbant medium is adhesively bonded to the backing strip.
Claim 17
Dependent Claim
23 words
The indicator according to claim 15 wherein the solution concentration of sulfite is 1 molar and the amine compound concentration is 0.2 molar.
Claim 18
Dependent Claim
13 words
The indicator according to claim 1 wherein the amine compound is amino acid.
Claim 19
Dependent Claim
12 words
The indicator according to claim 17 wherein the amino acid is glycine.
Claim 20
Dependent Claim
13 words
The indicator according to claim 18 wherein the sulfite compound is sodium sulfite.
Claim 21
Dependent Claim
15 words
The indicator according to claim 18 wherein the paper is chomotography paper or filter paper.
Claim 22
Dependent Claim
55 words
A glutaraldehyde indicator comprising an absorbant medium having deposited thereon a mixture of a sulfite compound and an amine compound wherein the amine compound is (1) an amino acid, where the amino acid is glycine or lysine; or (2) an ammonium compound, the molar ratio of sulfite to amine compound being about 2.5/1 to 20/1.
Claim 23
Dependent Claim
55 words
A glutaraldehyde indicator comprising an absorbant medium having deposited thereon a mixture of a sulfite compound and an amine compound wherein the amine compound is (1) an amino acid, where the amino acid is glycine or lysine; or (2) an ammonium compound, the molar ratio of sulfite to amine compound being about 2.5/1 to 20/1.
Claim 24
Dependent Claim
24 words
The indicator according to claim 21 wherein the sulfite is sodium sulfite, the amino acid is glycine and the absorbant medium is chromotography paper.
Claim 25
Dependent Claim
14 words
The indicator according to claim 21 wherein the amine compound is glycine or lysine.
Claim 26
Dependent Claim
20 words
The indicator according to claim 21 wherein the molar ratio of sulfite to amine compound is about 2.5/1 to 20/1.
Claim 27
Dependent Claim
17 words
The indicator according to claim 24 wherein the molar ratio of sulfite to amino acid is 5/1.
Claim 28
Dependent Claim
14 words
The indicator according to claim 21 wherein the amine compound is an ammonium compound.
Claim 29
Dependent Claim
22 words
The indicator according to claim 26 wherein the ammonium compound is ammonium chloride, ammonium bromide, ammonium bicarbonate, ammonium acetate, or ammonium formate.
Claim 30
Dependent Claim
22 words
The indicator according to claim 21 wherein the concentration of amino acid on the absorbant medium is about 0.1M to about 0.3M.
Claim 31
Dependent Claim
22 words
The indicator according to claim 28 wherein the concentration of amino acid on the absorbant medium is about 0.15M to about 0.25M.
Claim 32
Dependent Claim
13 words
The indicator according to claim 29 wherein the amino acid concentration is 0.2M.
References Cited (Backward Citations)
US4075321A
Cited
US3945798A
Cited
US3960895A
Cited
US4173515A
Cited
US4328182A
Cited
US4308028A
Cited
GB2085583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |