US4237223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet for picking off microorganisms
Assignee: Merck Patent GmbH
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Filing: 1979-04-20
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Granted: 1980-12-02
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Expires: 1999-04-20
Abstract
Abstract A method of determining the presence of microorganisms on a surface comprises contacting the surface to be tested for the presence of microorganisms with an adhesive side of a sheet consisting essentially of a porous, flexible support material having an adhesive surface on at least one side such that when contacted with a microorganism-containing surface, the microorganisms will be adhered thereto; removing the sheet from this surface; placing the sheet on a sterile culture medium for microorganisms, the side placed on the medium being that opposite the side which was in contact with the test surface; incubating the sheet; and analyzing the incubated sheet for the presence of microorganisms. A sheet for use in the method comprises a porous, flexible support material having an adhesive surface on at least one side and which is sterile throughout, said adhesive surface being such that when contacted with a microorganism-containing surface, the microorganisms will be adhered thereto.
Inventors
- 👤 Harald Metz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:30
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/02; C12Q1/04; Y; Y10; Y10S; Y10S435/00; Y10S435/805; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249983; Y10T428/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
110 words
A method of determining the presence of microorganisms on a surface which comprises contacting the surface to be tested for the presence of microorganisms with an adhesive side of a sheet consisting essentially of a porous, flexible support material having an adhesive surface on at least one side such that when contacted with a microorganism-containing surface, the microorganisms will be adhered thereto; removing the sheet from this surface; placing the sheet on a sterile culture medium for microorganisms, the side placed on the medium being that opposite the side which was in contact with the test surface; incubating the sheet; and analyzing the incubated sheet for the presence of microorganisms.
Claim 2
Independent Claim
110 words
A method of determining the presence of microorganisms on a surface which comprises contacting the surface to be tested for the presence of microorganisms with an adhesive side of a sheet consisting essentially of a porous, flexible support material having an adhesive surface on at least one side such that when contacted with a microorganism-containing surface, the microorganisms will be adhered thereto; removing the sheet from this surface; placing the sheet on a sterile culture medium for microorganisms, the side placed on the medium being that opposite the side which was in contact with the test surface; incubating the sheet; and analyzing the incubated sheet for the presence of microorganisms.
Claim 3
Dependent Claim
31 words
The method of claim 1, wherein the porosity of the support material is such that microorganisms cannot pass through the support material but a culture medium for microorganisms can pass through.
Claim 4
Dependent Claim
24 words
The method of claim 2, wherein the porosity of the support material is such that the average pore diameter is up to 0.5 μm.
Claim 5
Dependent Claim
50 words
The method of claim 3, wherein the sheet further comprises a sterile, removable backing on the side of the sheet opposite to the adhesive side, said removable backing serving as an applicator whereby the adhesive side may be contacted with the surface to be tested without otherwise contaminating the sheet.
Claim 6
Dependent Claim
74 words
A sheet for picking off microorganisms from a surface which comprises a porous, flexible support material having an adhesive surface on at least one side and which is sterile throughout, said adhesive surface being such that when contacted with a microorganism-containing surface, the microorganisms will be adhered thereto, wherein the porosity of the support material is such that microorganisms cannot pass through the support material but a culture meduim for microorganisms can pass through.
Claim 7
Dependent Claim
74 words
A sheet for picking off microorganisms from a surface which comprises a porous, flexible support material having an adhesive surface on at least one side and which is sterile throughout, said adhesive surface being such that when contacted with a microorganism-containing surface, the microorganisms will be adhered thereto, wherein the porosity of the support material is such that microorganisms cannot pass through the support material but a culture meduim for microorganisms can pass through.
Claim 8
Dependent Claim
24 words
The sheet of claim 5, wherein the porosity of the support material is such that the average pore diameter is up to 0.5 μm.
Claim 9
Dependent Claim
48 words
The sheet of claim 5 which further comprises a sterile, removable backing on the side of the sheet opposite to the adhesive side, said removable backing serving as an applicator whereby the adhesive side may be contacted with the surface to be tested without otherwise contaminating the sheet.
Claim 10
Dependent Claim
10 words
A sterile container containing the sterile sheet of claim 7.
Claim 11
Dependent Claim
48 words
The sheet of claim 5 which further comprises a sterile, removable backing on the side of the sheet opposite to the adhesive side, said removable backing serving as an applicator whereby the adhesive side may be contacted with the surface to be tested without otherwise contaminating the sheet.
Claim 12
Dependent Claim
26 words
The sheet of claim 9, wherein the adhesive surface of the sheet is formed by adhering an adhesive layer to one side of the support material.
Claim 13
Dependent Claim
10 words
A sterile container containing the sterile sheet of claim 5.
Claim 14
Dependent Claim
26 words
The sheet of claim 5, wherein the adhesive surface of the sheet is formed by adhering an adhesive layer to one side of the support material.
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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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |