Patent US3394650A successfully refreshed from Google Patents.
Patent US3992154A successfully refreshed from Google Patents.
US3992154A
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Ethylene oxide sterilization indicator
Assignee: MDT Corp
•
Filing: 1975-12-22
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Granted: 1976-11-16
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Expires: 1995-12-22
Abstract
Abstract A monitoring device for use in ethylene oxide sterilizing systems consists of an envelope containing an indicator coated with a dye, which besides showing a color change on completion of sterilizing cycle also indicates the completion of the subsequent aeration cycle.
Inventors
- 👤 James E. Whitbourne
- 👤 Carolyn A. Eastman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:23
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/226; A; A61; A61L; A61L2/00; A61L2/26; A61L2/28; Y; Y10; Y10T; Y10T436/00; Y10T436/14; Y10T436/142222; Y10T436/20; Y10T436/200833
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
57 words
A method of monitoring a sterilization and aeration process employing ethylene oxide as sterilant in presence of controlled humid atmosphere and temperature comprising: a. exposing goods and an indicator to the sterilant till the indicator undergoes a color change; b. placing the goods and said indicator in an aeration chamber till the indicator undergoes another color change.
Claim 2
Independent Claim
57 words
A method of monitoring a sterilization and aeration process employing ethylene oxide as sterilant in presence of controlled humid atmosphere and temperature comprising: a. exposing goods and an indicator to the sterilant till the indicator undergoes a color change; b. placing the goods and said indicator in an aeration chamber till the indicator undergoes another color change.
Claim 3
Dependent Claim
18 words
Method of claim 1 wherein the step (a) the indicator shows a color change from white to violet.
Claim 4
Dependent Claim
20 words
Method of claim 1 wherein in the step (b) the indicator shows a color change from violet to gray green.
Claim 5
Dependent Claim
20 words
Method of claim 1 where the indicator comprises: a. carrier means; b. an indicator composition carried by the carrier means.
Claim 6
Dependent Claim
13 words
Method of claim 4 where carrier means is Whatman No. 1 filter paper.
Claim 7
Dependent Claim
24 words
Method of claim 4 wherein the indicating composition changes color from white to violet upon sterilization and from violet to gray green upon aeration.
Claim 8
Dependent Claim
17 words
Method of claim 4 where quantity impregnated upon carrier means is approximately 0.0200-0.1000 gms per square inch.
Claim 9
Dependent Claim
13 words
Method of claim 4 wherein the carrier means is enclosed in an enclosure.
Claim 10
Dependent Claim
10 words
Method of claim 8 wherein the enclosure is an envelope.
Claim 11
Dependent Claim
18 words
Method of claim 4 wherein the indicating composition comprises the following ingredients 4(p-nitrobenzyl) pyridine Polyethylene Glycol Thiourea Water
Claim 12
Dependent Claim
43 words
Method of claim 10 where the proportions of the ingredients are: ______________________________________
Polyethylene Glycol Mol wt. 200
40 - 60 gms
Polyethylene Glycol Mol wt. 400
40 - 60
4(p-nitrobenzyl) pyridine
1 - 2.5
Thiourea 1 - 1.5
Water 2 - 3
______________________________________
Claim 13
Dependent Claim
35 words
Method of claim 10 where the proportions of the ingredients are: ______________________________________
Polyethylene Glycol mol. wt. 1500
90 - 100 gms.
4(p-nitrobenzyl) pyridine
1.5 - 3.5
Thiourea 1 - 1.5
Water 2 - 3
______________________________________
Claim 14
Dependent Claim
42 words
A composition of mixture comprising the following in corresponding proportions: ______________________________________
Polyethylene Glycol mol. wt. 200
40 - 60 gms
Polyethylene Glycol mol. wt. 400
40 - 60
4(p-nitrobenzyl) pyridine
1 - 2.5
Thiourea 1 - 1.5
Water 2 - 3
______________________________________
Claim 15
Dependent Claim
42 words
A composition of mixture comprising the following in corresponding proportions: ______________________________________
Polyethylene Glycol mol. wt. 200
40 - 60 gms
Polyethylene Glycol mol. wt. 400
40 - 60
4(p-nitrobenzyl) pyridine
1 - 2.5
Thiourea 1 - 1.5
Water 2 - 3
______________________________________
Claim 16
Dependent Claim
35 words
A composition of mixture comprising the following in the corresponding proportions: ______________________________________
Polyethylene Glycol mol. wt. 1500
90 - 100 gms
4(p-nitrobenzyl) pyridine
1.5 - 3.5
Thiourea 1 - 1.5
Water 2 - 3
______________________________________
Claim 17
Dependent Claim
35 words
A composition of mixture comprising the following in the corresponding proportions: ______________________________________
Polyethylene Glycol mol. wt. 1500
90 - 100 gms
4(p-nitrobenzyl) pyridine
1.5 - 3.5
Thiourea 1 - 1.5
Water 2 - 3
______________________________________
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) | 1979-11-16 | 1980-05-17 | 1980-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-16 | 1984-05-17 | 1984-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-16 | 1988-05-17 | 1988-11-16 | $7700.00 | Window Closed / Lapsed |