US3865274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid dispensing apparatus
Assignee: Becton Dickinson and Co
•
Filing: 1973-02-27
•
Granted: 1975-02-11
•
Expires: 1993-02-27
Abstract
Abstract A liquid dispensing apparatus for use in performing the Coombs anti-globulin test. The Coombs injecting mechanism includes a removable cartridge containing the serum. The cartridge comprises a tubular barrel which is closed at its forward end by a nozzle and at its rear end by a cylindrical piston positioned within the bore of the barrel. The mechanism further includes a plunger for driving the piston into the bore of the barrel to dispense the liquid from the forward nozzle downwardly into a vial upon demand from a Coombs blood test machine associated therewith.
Inventors
- 👤 Joseph N Genese
- 👤 Edward J Rapoza
- 👤 Charles F Galanaugh
- 👤 Harry M Kennard
- 👤 Roger A Chevalaz
- 👤 John A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:35
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/0289; B01L3/0293; B01L3/0203; B01L3/0206; B04; B04B; B04B5/00; B04B5/04; B04B5/0407; B04B5/0414; B04B5/0421; G; G01; G01N; G01N35/00; G01N35/02; G01N35/025; B04B11/00; B04B11/04; B04B2011/046; G01N2035/00465; G01N2035/00495
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
236 words
A liquid dispensing apparatus comprising: a cartridge adapted to retain a quantity of liquid, said cartridge comprising a tubular barrel closed at one end by a nozzle and at the opposite end by a cylindrical piston, said cylindrical piston being positioned within the bore of said tubular barrel and having an external diameteradapted to sealingly engage the interior cylindrical surface of said bore, a holding frame for mounting said cartridge with said nozzle directed downwardly, same frame further mounting an axially movable plunger having a forward end adapted to engage the outer wall of said cylindrical piston, and means for axially advancing said plunger a predetermined distance whereby said piston is axially advanced into the bore of said tubular barrel and a predetermined quantity of said liquid is ejected through said nozzle, means for initially advancing said plunger into engagement with the outer wall of said cylinder plug, said initial advance means comprising a control rod disposed coaxially within said plunger, said control rod being axially movable within said plunger and being normally disposed to extend a short distance beyond said forward end of said plunger, switch means at the rear end of said plunger operatively connected to said control rod to detect rearward movement of said control rod in relation to said plunger, and said switch means acting to terminate said initial advance means when said control rod contacts the outside wall of said piston.
Claim 2
Dependent Claim
236 words
A liquid dispensing apparatus comprising: a cartridge adapted to retain a quantity of liquid, said cartridge comprising a tubular barrel closed at one end by a nozzle and at the opposite end by a cylindrical piston, said cylindrical piston being positioned within the bore of said tubular barrel and having an external diameteradapted to sealingly engage the interior cylindrical surface of said bore, a holding frame for mounting said cartridge with said nozzle directed downwardly, same frame further mounting an axially movable plunger having a forward end adapted to engage the outer wall of said cylindrical piston, and means for axially advancing said plunger a predetermined distance whereby said piston is axially advanced into the bore of said tubular barrel and a predetermined quantity of said liquid is ejected through said nozzle, means for initially advancing said plunger into engagement with the outer wall of said cylinder plug, said initial advance means comprising a control rod disposed coaxially within said plunger, said control rod being axially movable within said plunger and being normally disposed to extend a short distance beyond said forward end of said plunger, switch means at the rear end of said plunger operatively connected to said control rod to detect rearward movement of said control rod in relation to said plunger, and said switch means acting to terminate said initial advance means when said control rod contacts the outside wall of said piston.
Claim 3
Dependent Claim
75 words
The liquid dispensing apparatus as defined in claim 1 further including means to indicate the amount of liquid remaining in said cartridge, sAid indicator means comprising an abutment surface positioned on said plunger intermediate the ends thereof and a cam follower mounted on said frame and adapted to be contacted by said abutment surface during the advance of said plunger into said tubular barrel, said cam follower being operatively connected to an external signal means.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |