Patent US4636472A successfully refreshed from Google Patents.
US4636472A
Expired / Lapsed
US
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Disposable sterilization biological test pack
Assignee: 3M Co
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Filing: 1985-05-16
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Granted: 1987-01-13
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Expires: 2005-05-16
Abstract
Abstract A disposable sterilization test pack for determining the efficacy of sterilizing equipment comprises a porous base pad having a cavity for receiving the sterilization indicator. Porous pads are disposed on opposite sides of the base pad to retain the sterilization indicator within the cavity, and an impermeable layer is disposed against one of the porous pads to confine the introduction and evacuation of air from the test pack to the edges of the test pack and the exposed porous pad which is not covered by the impermeable layer.
Inventors
- 👤 Loran H. Bruso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:10
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/26; A61L2/28; C; C12; C12Q; C12Q1/00; C12Q1/02; C12Q1/22; Y; Y10; Y10S; Y10S435/00; Y10S435/81
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
154 words
A disposble pack for testing the efficacy of a sterilization process comprises: a plurality of gas permeable porous sheets, each of said sheets being cut to form a hole therethrough and stacked to form a base pad having a top surface, a bottom surface, an edge therebetween and a cavity established by the alignment of said holes for receiving a sterilization indicator therein; a top pad having an edge and disposed against said top surface with its edge substantially flush with said edge of said base pad; a porous bottom pad having an edge and disposed against said bottom surface with its edge substantially flush with said edge of said base pad; and a gas impermeable layer disposed against said top pad to substantially direct the passage of gas into and out of said pack through said edges of said top pad, said middle pad and said bottom pad and through said bottom pad.
Claim 2
Dependent Claim
154 words
A disposble pack for testing the efficacy of a sterilization process comprises: a plurality of gas permeable porous sheets, each of said sheets being cut to form a hole therethrough and stacked to form a base pad having a top surface, a bottom surface, an edge therebetween and a cavity established by the alignment of said holes for receiving a sterilization indicator therein; a top pad having an edge and disposed against said top surface with its edge substantially flush with said edge of said base pad; a porous bottom pad having an edge and disposed against said bottom surface with its edge substantially flush with said edge of said base pad; and a gas impermeable layer disposed against said top pad to substantially direct the passage of gas into and out of said pack through said edges of said top pad, said middle pad and said bottom pad and through said bottom pad.
Claim 3
Dependent Claim
23 words
A disposable pack as cited in claim 1 further comprising a gas permeable porous overwrap surrounding said pack to maintain the integrity thereof.
Claim 4
Dependent Claim
16 words
A disposable pack as cited in claim 2 wherein the sterilization indicator is a biological indicator.
Claim 5
Dependent Claim
16 words
A disposable pack as cited in claim 2 wherein the sterilization indicator is a chemical indicator.
Claim 6
Dependent Claim
20 words
A disposable pack as cited in claim 2 wherein the sterilization indictor comprises a biological indicator and a chemical indicator.
Claim 7
Dependent Claim
31 words
A disposable pack as cited in claim 2 wherein said top pad comprises a single gas permeable porous sheet and said bottom pad comprises a plurality of gas permeable porous sheets.
Claim 8
Dependent Claim
17 words
A disposable pack as cited in claim 2 wherein said gas impermeable layer is a plastic laminate.
Claim 9
Dependent Claim
145 words
A disposable biological test pack for testing the efficacy of a sterilization process comprises: a plurality of gas permeable porous sheets, each of said sheets being cut to form a hole therethrough and stacked to form a base pad having a top surface, a bottom surface, an edge therebetween and a cavity established by the alignment of said holes for receiving a sterilization indicator therein; a top pad having an edge and a gas impermeable layer laminated to said top pad to prevent the passage of gas into and out of said pack through said impermeable layer and positioned against said top surface of said base pad with its edge substantially flush with said edge of said base pad; and a porous bottom pad having an edge and disposed against said bottom surface with its edge substantially flush with said edge of said base pad.
Claim 10
Dependent Claim
145 words
A disposable biological test pack for testing the efficacy of a sterilization process comprises: a plurality of gas permeable porous sheets, each of said sheets being cut to form a hole therethrough and stacked to form a base pad having a top surface, a bottom surface, an edge therebetween and a cavity established by the alignment of said holes for receiving a sterilization indicator therein; a top pad having an edge and a gas impermeable layer laminated to said top pad to prevent the passage of gas into and out of said pack through said impermeable layer and positioned against said top surface of said base pad with its edge substantially flush with said edge of said base pad; and a porous bottom pad having an edge and disposed against said bottom surface with its edge substantially flush with said edge of said base pad.
Claim 11
Dependent Claim
23 words
A disposable pack as cited in claim 8 further comprising a gas permeable porous overwrap surrounding said pack to maintain the integrity thereof.
Claim 12
Dependent Claim
16 words
A disposable pack as cited in claim 9 wherein the sterilization indicator is a biological indicator.
Claim 13
Dependent Claim
16 words
A disposable pack as cited in claim 9 wherein the sterilization indicator is a chemical indicator.
Claim 14
Dependent Claim
20 words
A disposable pack as cited in claim 9 wherein the sterilization indicator comprises a biological indicator and a chemical indicator.
Claim 15
Dependent Claim
220 words
A disposable pack for testing the efficacy of a sterilization process comprises: a plurality of porous sheets, each having a hole cut therethrough and stacked to form a base pad having a top surface, a bottom surface, an edge therebetween and a cavity established by the alignment of said holes for recieving a sterilization indicator therein; a top pad having an edge and a surface disposed against said top surface with its edge substantially flush with said edge of said base pad; a porous bottom pad having an edge and disposed against said bottom surface with its edge substantially flush with said edge of said base pad; a gas impermeable nonporous layer disposed against said top pad to substantially direct the passage of gas into and out of said pack through said edge of said base pad and through said top pad; a layer of reticulated foam having an edge and disposed against said bottom pad with its edge flush with the edge of said bottom pad to position said bottom pad between said foam layer and said base pad; and a cover pad having an edge and a surface covered with a gas impermeable nonporous plastic laminate and disposed against said foam layer opposite said bottom pad with its edge substantially flush with the edge of said foam layer.
Claim 16
Dependent Claim
220 words
A disposable pack for testing the efficacy of a sterilization process comprises: a plurality of porous sheets, each having a hole cut therethrough and stacked to form a base pad having a top surface, a bottom surface, an edge therebetween and a cavity established by the alignment of said holes for recieving a sterilization indicator therein; a top pad having an edge and a surface disposed against said top surface with its edge substantially flush with said edge of said base pad; a porous bottom pad having an edge and disposed against said bottom surface with its edge substantially flush with said edge of said base pad; a gas impermeable nonporous layer disposed against said top pad to substantially direct the passage of gas into and out of said pack through said edge of said base pad and through said top pad; a layer of reticulated foam having an edge and disposed against said bottom pad with its edge flush with the edge of said bottom pad to position said bottom pad between said foam layer and said base pad; and a cover pad having an edge and a surface covered with a gas impermeable nonporous plastic laminate and disposed against said foam layer opposite said bottom pad with its edge substantially flush with the edge of said foam layer.
Claim 17
Dependent Claim
23 words
A disposable pack as cited in claim 13 further comprising a gas permeable porous overwrap surrounding said pack to maintain the integrity thereof.
Claim 18
Dependent Claim
140 words
A disposable biological test pack for testing the efficacy of a sterilization process comprises: a plurality of gas permeable porous sheets, each of said sheets being cut to form a hole therethrough and stacked to form a base pad having a top surface, a bottom surface, an edge therebetween and a cavity established by the alignment of said holes for receiving a sterilization indicator therein; a porous bottom pad having an edge and disposed against said bottom surface with its edge substantially flush with said edge of said base pad; and a gas impermeable top pad having an edge and disposed against said top surface with its edge substantially flush with said edge of said pad to direct the passage of gas into and out of said pack through said edges of said middle pad and through said bottom pad.
Claim 19
Dependent Claim
140 words
A disposable biological test pack for testing the efficacy of a sterilization process comprises: a plurality of gas permeable porous sheets, each of said sheets being cut to form a hole therethrough and stacked to form a base pad having a top surface, a bottom surface, an edge therebetween and a cavity established by the alignment of said holes for receiving a sterilization indicator therein; a porous bottom pad having an edge and disposed against said bottom surface with its edge substantially flush with said edge of said base pad; and a gas impermeable top pad having an edge and disposed against said top surface with its edge substantially flush with said edge of said pad to direct the passage of gas into and out of said pack through said edges of said middle pad and through said bottom pad.
Claim 20
Dependent Claim
23 words
A disposable pack as cited in claim 15 further comprising a gas permeable porous overwrap surrounding said pack to maintain the integrity thereof.
Claim 21
Dependent Claim
16 words
A disposable pack as cited in claim 16 wherein the sterilization indicator is a biological indicator.
Claim 22
Dependent Claim
16 words
A disposable pack as cited in claim 16 wherein the sterilization indicator is a chemical indicator.
Claim 23
Dependent Claim
20 words
A disposable pack as cited in claim 16 wherein the sterilization indicator comprises a biological indicator and a chemical indicator.
Claim 24
Dependent Claim
30 words
A disposable pack as cited in claim 16 wherein said top pad comprises a single gas impermeable layer and said bottom pad comprises a plurality of gas permeable porous sheets.
References Cited (Backward Citations)
US3239429A
Cited
US3440144A
Cited
US3661717A
Cited
US3996802A
Cited
US4304869A
Cited
US4291122A
Cited
US4397945A
Cited
US4486387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |