Patent US4938389A successfully refreshed from Google Patents.
US4938389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter bottle
Assignee: The Schepens Eye Research Institute Inc
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Filing: 1988-11-03
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Granted: 1990-07-03
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Expires: 2008-11-03
Abstract
Abstract A multidose liquid dispenser for maintaining the sterility of solutions without a preservative has been developed. The dispenser includes a filter assembly having a hydrophobic filter and a hydrophilic filter in tandem with the hydrophobic filter located near the dispensing tip. The use of the hydrophobic exterior filter and the hydrophilic interior filter permits excellent liquid flow while precluding the growth of bacteria on the filter. The inability of the bacteria to attach to the exterior hydrophobic filter prevents clogging of the pores.
Inventors
- 👤 Scott R. Rossi
- 👤 Jeffrey P. Gilbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:26
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/24; A; A61; A61F; A61F9/00; A61F9/0008; B65D47/00; B65D47/04; B65D47/06; B65D47/18; A61J; A61J1/00; A61J1/14; A61J1/1443; A61J1/145; A61J1/1456; A61J1/1468
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A liquid dispenser for dispensing sterile liquids comprising: a reservoir compartment adapted for storing sterile liquids; a tip adapted to dispense said sterile liquids; a flow passage providing fluid communication between said tip and said reservoir; and a filter assembly, said filter assembly being sealed in said fluid passage so that it extends across the entire expanse of said flow passage to prevent fluid and air flow except through said filter assembly, said filter assembly comprising a hydrophilic filter and a hydrophobic filter arranged in fluid communication serially along said flow passage so that said hydrophilic filter is nearer to said reservoir than said hydrophobic filter, said hydrophobic filter and said hydrophilic filter each having pores sufficiently small to act as microbial filters.
Claim 2
Dependent Claim
123 words
A liquid dispenser for dispensing sterile liquids comprising: a reservoir compartment adapted for storing sterile liquids; a tip adapted to dispense said sterile liquids; a flow passage providing fluid communication between said tip and said reservoir; and a filter assembly, said filter assembly being sealed in said fluid passage so that it extends across the entire expanse of said flow passage to prevent fluid and air flow except through said filter assembly, said filter assembly comprising a hydrophilic filter and a hydrophobic filter arranged in fluid communication serially along said flow passage so that said hydrophilic filter is nearer to said reservoir than said hydrophobic filter, said hydrophobic filter and said hydrophilic filter each having pores sufficiently small to act as microbial filters.
Claim 3
Dependent Claim
20 words
The liquid dispenser of claim 1 wherein said hydrophobic filter and said hydrophilic filter are separated in said filter assembly.
Claim 4
Dependent Claim
20 words
The liquid dispenser of claim 2 wherein said hydrophobic filters and said hydrophilic filters are separated by a support ring.
Claim 5
Dependent Claim
15 words
The liquid dispenser of claim 3 wherein said filter assembly comprises a plurality of support
Claim 6
Dependent Claim
28 words
The liquid dispenser of claim 1 wherein said filter assembly is located in said flow passage such that said hydrophobic filter is substantially at said liquid dispensing tip.
Claim 7
Dependent Claim
19 words
The liquid dispenser of claim 1 wherein said filter assembly is sealed in said flow passage by an adhesive.
Claim 8
Dependent Claim
19 words
The flow dispenser of claim 1 wherein said filter assembly is sealed in said flow passage by ultrasonic sealing.
Claim 9
Dependent Claim
19 words
The liquid dispenser of claim 1 wherein said filter assembly is sealed in said flow passage by heat sealing.
Claim 10
Dependent Claim
14 words
The liquid dispenser of claim 1 wherein said liquid dispenser comprises a multidose dispenser.
References Cited (Backward Citations)
US644703A
Cited
US2626606A
Cited
US2807288A
Cited
US3149758A
Cited
US3154074A
Cited
US3189223A
Cited
US3335917A
Cited
US3323684A
Cited
US3756472A
Cited
US4533068A
Cited
US4441996A
Cited
US4463880A
Cited
US4443336A
Cited
DE3419572A1
Cited
US4764274A
Cited
US4811866A
Cited
US4767016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |