US3986645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid dispenser
Assignee: MPL Inc
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Filing: 1975-05-28
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Granted: 1976-10-19
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Expires: 1995-05-28
Abstract
Abstract A liquid dispenser in the form of a syringe having a barrel, with a piston valve/seal slidable in the barrel bore and having a preformed liquid passage hole extending through a slidable elastic main body thereof in which an elastic hour-glass shaped plug seal is removably disposed. A rearwardly extending post fixed on the forward end wall of the barrel bore effects rearward knockout removal of the plug seal from the preformed hole as a function of forward sliding movement of the piston valve/seal in the bore, and a liquid flow passage is formed in the post to enable passage of liquid therepast. The piston valve/seal main body has a plug-containment chamber which is larger than the plug and enables by-pass liquid flow past the plug after dislodgment of the plug into this chamber.
Inventors
- 👤 Brian E. Baldwin
- 👤 Alfred C. Einstein
- 👤 Ronald D. Baxa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:02
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31511; A61M5/28; A61M5/285; A61M5/286; A61M2005/287; A61M5/3129; A61M5/3134; A61M5/32; A61M5/34; A61M5/347
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
205 words
A liquid dispenser comprising a barrel having a liquid discharge orifice and a liquid containment chamber bore for connection with said discharge orifice, a piston valve/seal slidably disposed in sealing relation in said bore and having a preformed liquid passage hole extending through a piston valve/seal main piston body thereof in which a knockout plug seal is removably elastically disposed, said knockout plug seal having an annular generally hour-glass peripheral shape, a rearwardly extending post disposed in said bore and more resistant to movement than said piston valve/seal, said post being engageable wth said plug as a function of forward sliding movement of said piston valve/seal in said bore, to effect rearward knockout removal of said hour-glass-shaped plug seal from said liquid passage hole, and a manually manipulable liquid-flow-effecting piston disposed rearwardly of said piston valve/seal, said piston valve/seal main piston body having a plug-seal-retaining cavity larger than said plug seal to permit fluid flow past said plug seal when said plug seal is ejected into said plug-seal-retaining cavity and connecting with said bore for ejection of plug seal thereinto as a function of interengagement between said post and said plug seal, said plug-seal-retaining cavity being open at its rear end for fluid flow therethrough.
Claim 2
Dependent Claim
205 words
A liquid dispenser comprising a barrel having a liquid discharge orifice and a liquid containment chamber bore for connection with said discharge orifice, a piston valve/seal slidably disposed in sealing relation in said bore and having a preformed liquid passage hole extending through a piston valve/seal main piston body thereof in which a knockout plug seal is removably elastically disposed, said knockout plug seal having an annular generally hour-glass peripheral shape, a rearwardly extending post disposed in said bore and more resistant to movement than said piston valve/seal, said post being engageable wth said plug as a function of forward sliding movement of said piston valve/seal in said bore, to effect rearward knockout removal of said hour-glass-shaped plug seal from said liquid passage hole, and a manually manipulable liquid-flow-effecting piston disposed rearwardly of said piston valve/seal, said piston valve/seal main piston body having a plug-seal-retaining cavity larger than said plug seal to permit fluid flow past said plug seal when said plug seal is ejected into said plug-seal-retaining cavity and connecting with said bore for ejection of plug seal thereinto as a function of interengagement between said post and said plug seal, said plug-seal-retaining cavity being open at its rear end for fluid flow therethrough.
Claim 3
Dependent Claim
21 words
A dispenser according to claim 1, said piston valve/seal main piston body and said plug seal being formed of elastomeric material.
Claim 4
Dependent Claim
67 words
A dispenser according to claim 2, said open rear end of said cavity having an end opening a portion of which is larger in cross-section than the relaxed size of said plug seal and a portion of which opening is smaller than said plug seal to thereby retain said plug seal after ejection into said cavity, while aiding in enabling fluid flow therepast and through said opening.
Claim 5
Dependent Claim
32 words
A dispenser according to claim 3, the interface between said open rear end of said cavity and said plug seal being of interrupted configuration and providing a fluid flow interface channel therepast.
Claim 6
Dependent Claim
29 words
A dispenser according to claim 4, said interface channel being formed between the annular peripheral surface of said plug seal and the adjacent peripheral wall surface forming said hole.
Claim 7
Dependent Claim
48 words
A dispenser according to claim 4, and the interface between the rear wall surface bounding said liquid passage hole and the forwardly facing surface of said plug seal upon ejection of said plug seal into said cavity being of interrupted configuration and forming a fluid flow channel therepast.
Claim 8
Dependent Claim
31 words
A dispenser according to claim 1, the interface between said open rear end of said cavity and said plug seal being of interrupted configuration and providing a fluid flow channel therepast.
Claim 9
Dependent Claim
29 words
A dispenser according to claim 7, said interface channel being formed between the annular peripheral surface of said plug seal and the adjacent peripheral wall surface forming said hole.
Claim 10
Dependent Claim
48 words
A dispenser according to claim 7, and the interface between the rear wall surface bounding said liquid passage hole and the forwardly facing surface of said plug seal upon ejection of said plug seal into said cavity being of interrupted configuration and forming a fluid flow channel therepast.
Claim 11
Dependent Claim
27 words
A dispenser according to claim 1 said bore having a forward end wall on which said post is fixed and from which said post protrudes rearwardly therefrom.
Claim 12
Dependent Claim
21 words
A dispenser according to claim 10, said post having a liquid passage channel formed therein and communicable with said discharge orifice.
Claim 13
Dependent Claim
21 words
A dispenser according to claim 11, said channel being a bore extending through said post and communicating with said discharge orifice.
Claim 14
Dependent Claim
45 words
A dispenser according to claim 12, an anti-blocking laterally extending liquid passage channel formed on said post to effectively prevent forward liquid flow blockage between said plug seal, piston valve/seal main piston body and post after rearward dislodgment of said plug seal from said hole.
Claim 15
Dependent Claim
19 words
A dispenser according to claim 1, said plug-seal-retaining cavity being larger in all corresponding dimensions than said plug seal.
Claim 16
Dependent Claim
195 words
A liquid dispenser comprising a barrel having a liquid discharge orifice and a liqid containment chamber bore for connection with said discharge orifice, a piston valve/seal slidably disposed in sealing relation in said bore and having a preformed liquid passage hole extending through a piston valve/seal main piston body thereof in which a knockout plug seal is removably elastically disposed; a rearwardly extending post disposed in said bore and more resistant to movement than said piston valve seal, said post being engageable with said plug as a function of forward sliding movement of said piston valve/seal in said bore, to effect rearward knockout removal of said plug seal from said liquid passage hole, and a manually manipulable liquid-flow-effecting piston disposed rearwardly of said piston valve/seal, said piston valve/seal main piston body having a plug-seal-retaining cavity larger than said plug seal to permit fluid flow past said plug seal when said plug seal is ejected into said plug-seal-retaining cavity and connecting with said bore for ejection of said plug seal thereinto as a function of interengagement between said post and said plug seal, said plug-seal-retaining cavity being open at its rear end for fluid flow therethrough.
Claim 17
Dependent Claim
195 words
A liquid dispenser comprising a barrel having a liquid discharge orifice and a liqid containment chamber bore for connection with said discharge orifice, a piston valve/seal slidably disposed in sealing relation in said bore and having a preformed liquid passage hole extending through a piston valve/seal main piston body thereof in which a knockout plug seal is removably elastically disposed; a rearwardly extending post disposed in said bore and more resistant to movement than said piston valve seal, said post being engageable with said plug as a function of forward sliding movement of said piston valve/seal in said bore, to effect rearward knockout removal of said plug seal from said liquid passage hole, and a manually manipulable liquid-flow-effecting piston disposed rearwardly of said piston valve/seal, said piston valve/seal main piston body having a plug-seal-retaining cavity larger than said plug seal to permit fluid flow past said plug seal when said plug seal is ejected into said plug-seal-retaining cavity and connecting with said bore for ejection of said plug seal thereinto as a function of interengagement between said post and said plug seal, said plug-seal-retaining cavity being open at its rear end for fluid flow therethrough.
Claim 18
Dependent Claim
21 words
A dispenser according to claim 15, said post having a liquid passage channel formed therein and communicable with said discharge orifice.
Claim 19
Dependent Claim
21 words
A dispenser according to claim 16, said channel being a bore extending through said post and communicating with said discharge orifice.
Claim 20
Dependent Claim
45 words
A dispenser according to claim 17, an anti-blocking laterally extending liquid passage channel formed on said post to effectively prevent forward liquid flow blockage between said plug seal, piston valve/seal main piston body and post after rearward dislodgment of said plug seal from said hole.
Claim 21
Dependent Claim
21 words
A dispenser according to claim 15, said piston valve/seal main piston body and said plug seal being formed of elastomeric material.
Claim 22
Dependent Claim
67 words
A dispenser according to claim 19, said open rear end of said cavity having an end opening a portion of which is larger in cross-section than the relazed size of said plug seal and a portion of which opening is smaller than said plug seal to thereby retain said plug seal after ejection into said cavity, while aiding in enabling fluid flow therepast and through said opening.
Claim 23
Dependent Claim
29 words
A dispenser according to claim 19, the interface between said open rear end of said cavity and said plug seal being irregular and providing a fluid flow channel therepast.
Claim 24
Dependent Claim
29 words
A dispenser according to claim 21, said interface channel being formed between the annular peripheral surface of said plug seal and the adjacent peripheral wall surface forming said hole.
Claim 25
Dependent Claim
48 words
A dispenser according to claim 21, and the interface between the rear wall surface bounding said liquid passage hole and the forwardly facing surface of said plug seal upon ejection of said plug seal into said cavity being of interrupted configuration and forming a fluid flow channel therepast.
Claim 26
Dependent Claim
31 words
A dispenser according to claim 15, the interface between said open rear end of said cavity and said plug seal being of interrupted configuration and providing a fluid flow channel therepast.
Claim 27
Dependent Claim
29 words
A dispenser according to claim 24, said interface channel being formed between the annular peripheral surface of said plug seal and the adjacent peripheral wall surface forming said hole.
Claim 28
Dependent Claim
48 words
A dispenser according to claim 24, and the interface between the rear wall surface bounding said liquid passage hole and the forwardly facing surface of said plug seal upon ejection of said plug seal into said cavity being of interrupted configuration and forming a fluid flow channel therepast.
Claim 29
Dependent Claim
19 words
A dispenser according to claim 15, said plug-seal-retaining cavity being larger in all corresponding dimensions than said plug seal.
Claim 30
Dependent Claim
144 words
A liquid dispenser comprising a barrel having a liquid discharge orifice and a liquid containment chamber bore for connection with said discharge orifice, a piston valve/seal slidably disposed in sealing relation in said bore and having a preformed liquid passage hole extending through a piston valve/seal main piston body thereof in which a knockout plug seal is removably elastically disposed, means to effect knockout removal of said plug seal from said liquid passage hole, and a manually manipulable liquid-flow-effecting piston disposed rearwardly of said piston valve/seal, said piston valve/seal main piston body having a plug-seal-retaining cavity larger than said plug seal to permit fluid flow past said plug seal when said plug seal is ejected into said plug-seal-retaining cavity and connecting with said bore for ejection of said plug seal thereinto, said plug-seal-retaining cavity being open at its outer end for fluid flow therethrough.
Claim 31
Dependent Claim
144 words
A liquid dispenser comprising a barrel having a liquid discharge orifice and a liquid containment chamber bore for connection with said discharge orifice, a piston valve/seal slidably disposed in sealing relation in said bore and having a preformed liquid passage hole extending through a piston valve/seal main piston body thereof in which a knockout plug seal is removably elastically disposed, means to effect knockout removal of said plug seal from said liquid passage hole, and a manually manipulable liquid-flow-effecting piston disposed rearwardly of said piston valve/seal, said piston valve/seal main piston body having a plug-seal-retaining cavity larger than said plug seal to permit fluid flow past said plug seal when said plug seal is ejected into said plug-seal-retaining cavity and connecting with said bore for ejection of said plug seal thereinto, said plug-seal-retaining cavity being open at its outer end for fluid flow therethrough.
Claim 32
Dependent Claim
27 words
A liquid dispenser according to claim 28, said plug-seal-retaining cavity being disposed rearwardly of said liquid passage hole in which said plug seal is removably elastically disposed.
Claim 33
Dependent Claim
21 words
A liquid dispenser according to claim 28, said piston valve/seal main piston body and plug seal being formed of elastomeric material.
Claim 34
Dependent Claim
33 words
A liquid dispenser according to claim 28, the interface between said open outer end of said cavity and said plug seal being of interrupted configuration and providing a fluid flow interface channel therepast.
Claim 35
Dependent Claim
48 words
A liquid dispenser according to claim 31, and the interface between the wall surface bounding said liquid passage hole and the adjacent interfacing surface of said plug seal upon ejection of said plug seal into said cavity being of interrupted configuration and forming a fluid flow channel therepast.
Claim 36
Dependent Claim
48 words
A liquid dispenser according to claim 28, and the interface between the wall surface bounding said liquid passage hole and the adjacent interfacing surface of said plug seal upon ejection of said plug seal into said cavity being of interrupted configuration and forming a fluid flow channel therepast.
Claim 37
Dependent Claim
70 words
A liquid dispenser according to claim 28, said open outer end of said cavity having an end opening, a portion of which is larger in cross-section than the relaxed size of said plug seal and a portion of which opening is smaller than said plug seal to thereby retain said plug seal after injection into said cavity, while aiding in enabling fluid flow therepast and through said outer end opening.
References Cited (Backward Citations)
US2735430A
Cited
US3151787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |