US4380235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metered drop dispensers
Assignee: Fresenius SE and Co KGaA
•
Filing: 1981-05-01
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Granted: 1983-04-19
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Expires: 2001-05-01
Abstract
Abstract A metered drop dispenser utilizing a drop former in which the facing end walls of a pair of coplanar, spaced apart plate members form a channel which is open on two sides and which has outwardly flared end portions at the channel exit.
Inventors
- 👤 Hal C. Danby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:09
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16886; A61M5/1689
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
In a metered drop dispenser device which includes a liquid reservoir, a drop forming means connected to the reservoir having an orifice at which drops of the liquid can be formed, a drop chamber coupled to the drop forming means through which drops fall and in which drops accummulate, a discharge device coupled to the bottom of the drop chamber for conveying the liquid to a utilization means, a metering means associated with the drop chamber for determining the drop rate, and drop rate control means to vary the drop rate, the improvement in the drop forming means comprising: a pair of coplanar and spaced apart plate members having substantially parallel, planar facing end walls.
Claim 2
Dependent Claim
115 words
In a metered drop dispenser device which includes a liquid reservoir, a drop forming means connected to the reservoir having an orifice at which drops of the liquid can be formed, a drop chamber coupled to the drop forming means through which drops fall and in which drops accummulate, a discharge device coupled to the bottom of the drop chamber for conveying the liquid to a utilization means, a metering means associated with the drop chamber for determining the drop rate, and drop rate control means to vary the drop rate, the improvement in the drop forming means comprising: a pair of coplanar and spaced apart plate members having substantially parallel, planar facing end walls.
Claim 3
Dependent Claim
20 words
In a meter drop dispenser in accordance with claim 1 in which said plate members are of substantially uniform thickness.
Claim 4
Dependent Claim
21 words
In a metered drop dispenser in accordance with claim 2 in which said plate members are of substantially the same thickness.
Claim 5
Dependent Claim
19 words
In a metered drop dispenser in accordance with claim 3 in which said walls are separated a predetermined distance.
Claim 6
Dependent Claim
26 words
In a metered drop dispenser in accordance with claim 4 in which said end walls form a rectangular, elongated channel which is open on two sides.
Claim 7
Dependent Claim
31 words
In a metered drop dispenser in accordance with claim 5 in which the lower portion of said facing end walls are flared away from another to form flared end wall portions.
Claim 8
Dependent Claim
51 words
In a metered drop dispenser in accordance with claim 6 in which the thickness of said plate members, the separation of said end wall, the flare angle of said flared end wall portion and the length of said flared end wall portion are selected to form drops of a preselected volume.
References Cited (Backward Citations)
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US2877547A
Cited
GB931327A
Cited
US3276639A
Cited
US3311628A
Cited
US3323691A
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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) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |