Patent US4727705A successfully refreshed from Google Patents.
US4727705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Package for membrane filters
Assignee: Entegris Inc
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Filing: 1986-12-04
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Granted: 1988-03-01
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Expires: 2006-12-04
Abstract
Abstract A hydrophobic membrane filter device is packaged in a moisture and bacteria impervious container with the pores of the membrane filter being filled with water. The package is then sterilized to kill any living organisms contained therein. Thereafter, a sufficient concentration of water is retained in the membrane pores thereby rendering the hydrophobic membrane filter device directly permeable to an aqueous fluid.
Inventors
- 👤 Joseph G. Zahka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:51
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/18; B65D81/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A method of packaging a hydrophobic membrane filter comprising the steps of: inserting said membrane filter into a moisture and bacteria impervious container, the pores of said membrane filter containing water and being substantially free of any other substance; sealing said container after said filter is inserted therein to form a fluid and bacteria tight sealed package; and sterilizing said sealed package such that after said sterilizing step water is retained within said pores.
Claim 2
Independent Claim
74 words
A method of packaging a hydrophobic membrane filter comprising the steps of: inserting said membrane filter into a moisture and bacteria impervious container, the pores of said membrane filter containing water and being substantially free of any other substance; sealing said container after said filter is inserted therein to form a fluid and bacteria tight sealed package; and sterilizing said sealed package such that after said sterilizing step water is retained within said pores.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said sterilizing step comprises steam sterilizing said sealed package.
Claim 4
Dependent Claim
18 words
The method of claim 1 including the step of adding water to said container prior to sealing thereof.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein said container is a composite plastic bag having an inner layer of polypropylene and an outer layer of mylar.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said container is sealed closed by heat sealing.
Claim 7
Dependent Claim
15 words
The method of claim 1 where said membrane filter is a pleated cartridge filtration device.
Claim 8
Dependent Claim
24 words
The method of claim 2 wherein said steam sterilization step further includes the step of controlling the air pressure within and without said container.
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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |