Patent US2849299A successfully refreshed from Google Patents.
Patent US3729031A successfully refreshed from Google Patents.
US3729031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid dispenser and plunger and method and apparatus for filling same
Assignee: MPL Inc
•
Filing: 1971-12-06
•
Granted: 1973-04-24
•
Expires: 1991-12-06
Abstract
Abstract A liquid dispenser having a liquid containment barrel with a slidable dispensing-effecting and sealing plunger, the plunger having a self-sealing slit formed therein to enable filling therethrough of the dispenser barrel, the slit being formed at the bottom forwardly facing end of a threaded handle-connecting recess in the exposed rear portion of the plunger. A male fill member is employed to be inserted into and releasably open the plunger slit and to selectively fill the barrel with liquid, while venting past the male fill member through a vent eye formed in the opened slit by insertion of the male fill member. The male fill member is assisted in opening the plunger slit by securing the member into the handle-receiving threaded recess, and subsequently a handle is screwed into this screw-threaded recess to enable selected manual dispensing of liquid from the dispenser. The preferred slitted plunger is molded as a single piece, and the slit therein is preferably formed by moving the plunger laterally past a knife edge to cut the self-sealing slit fully across the bottom of its generally cup-shaped extent.
Inventors
- 👤 B Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:56
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/1782; A61M5/31; A61M5/315; A61J; A61J1/00; A61J1/14; A61J1/20; A61J1/2003; A61J1/202; A61J1/2044; A61J1/2096; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24496
Claims Analysis
Total Claims: 59
Claim 1
Independent Claim
128 words
A liquid dispensing arrangement, comprising a barrel having a liquid-holding chamber with an effectively closed forward end which is selectively effectively openable for dispensing of liquid therethrough, said barrel having a rear end opening and having a sealing plunger movably disposed therein adjacent its rear end and connecting with said chamber for longitudinal sliding motion in and along said chamber, said plunger having means for connecting a handle thereto, and an openable pre-formed slit in said plunger and resiliently biased to a closed condition for enabling filling of said chamber with liquid from an external source and subsequent self-closure of said slit, said plunger and its said slit being engageable through said rear end opening for filling therethrough and for externally manually controlled sliding motion of said plunger.
Claim 2
Dependent Claim
128 words
A liquid dispensing arrangement, comprising a barrel having a liquid-holding chamber with an effectively closed forward end which is selectively effectively openable for dispensing of liquid therethrough, said barrel having a rear end opening and having a sealing plunger movably disposed therein adjacent its rear end and connecting with said chamber for longitudinal sliding motion in and along said chamber, said plunger having means for connecting a handle thereto, and an openable pre-formed slit in said plunger and resiliently biased to a closed condition for enabling filling of said chamber with liquid from an external source and subsequent self-closure of said slit, said plunger and its said slit being engageable through said rear end opening for filling therethrough and for externally manually controlled sliding motion of said plunger.
Claim 3
Dependent Claim
35 words
A liquid dispensing arrangement according to claim 1, said plunger having a threaded external recess formed therein for threadedly connecting a manipulatable handle thereto, said slit being formed in a forward wall defining said recess.
Claim 4
Dependent Claim
21 words
A liquid dispensing arrangement according to claim 2, said plunger being formed of elastic material in the zone of said slit.
Claim 5
Dependent Claim
18 words
A liquid dispensing arrangement according to claim 3, said plunger being an integral molded unit of elastic material.
Claim 6
Dependent Claim
14 words
A liquid dispensing arrangement according to claim 4, said plunger being formed of rubber.
Claim 7
Dependent Claim
38 words
A liquid dispensing arrangement according to claim 1, said barrel comprising a syringe having a finger grip thereon adjacent said rear end, and having an orifice at its forward end for facilitating dispensing of liquids from said chamber.
Claim 8
Dependent Claim
32 words
A liquid dispensing arrangement according to claim 6, said forward end of said barrel having a reduced diameter connector nose at its forward end, said orifice being formed in said connector nose.
Claim 9
Dependent Claim
26 words
A liquid dispensing arrangement according to claim 6, and a selectively effectively openable closure element forming said effective closure of said forward end of said chamber.
Claim 10
Dependent Claim
14 words
A liquid dispensing arrangement according to claim 8, said closure element being a valve.
Claim 11
Dependent Claim
16 words
A liquid dispensing arrangement according to claim 9, said closure element being a movable by-pass valve.
Claim 12
Dependent Claim
65 words
A liquid dispensing arrangement according to claim 8, said closure element being a slidable valve plug formed of elastic material engaging in sliding compressed and sealing relation within a forward end of said body, said body having a forward enlarged by-pass chamber for selective forward movement of said valve plug thereinto, to enable selected dispensing of liquid from said chamber past said by-pass valve plug.
Claim 13
Dependent Claim
19 words
A liquid dispensing arrangement according to claim 1, said slit extending across the full forward extent of said plunger.
Claim 14
Dependent Claim
25 words
A liquid dispensing arrangement according to claim 1, said slit exTending across a portion of and less then the full forward extent of said plunger.
Claim 15
Dependent Claim
19 words
A liquid dispensing arrangement according to claim 1, said slit extending fully through a seal wall of said plunger.
Claim 16
Dependent Claim
61 words
A liquid dispensing arrangement according to claim 1, said slit extending almost fully through a seal wall of said plunger and having a thin easily ruptured connecting web membrane which does not require pointed instrument puncture or piercing to be opened but which may be sheared upon and by stretching of said slit through insertion of said male fill member therein.
Claim 17
Dependent Claim
55 words
A dispenser for fluids, comprising a liquid-containment body fill-enabling a bore therein and a dual function dispensing-effecting and fill-enabling plunger longitudinally movable along said bore to effect dispensing movement of fluid along said bore and from within said body, said plunger having a pre-formed self-sealing opening therein for enablement of filling of said liquid-containment body.
Claim 18
Dependent Claim
55 words
A dispenser for fluids, comprising a liquid-containment body fill-enabling a bore therein and a dual function dispensing-effecting and fill-enabling plunger longitudinally movable along said bore to effect dispensing movement of fluid along said bore and from within said body, said plunger having a pre-formed self-sealing opening therein for enablement of filling of said liquid-containment body.
Claim 19
Dependent Claim
33 words
A dispenser for fluids according to claim 16, said plunger being a cup-shaped member formed of elastic material and having said opening formed in its bottom wall which extends forwardly in said body.
Claim 20
Dependent Claim
23 words
A dispenser for fluids according to claim 17, said opening being a self-closing slit having elastically deformable laterally interengageable and interfacing lip surfaces.
Claim 21
Dependent Claim
26 words
A dispenser for fluids according to claim 18, said slit extending across the full forward face of said plunger and along a partial rearward extent thereof.
Claim 22
Dependent Claim
21 words
A dispenser for fluids according to claim 18, said slit extending across less then the full forward extent of said plunger.
Claim 23
Dependent Claim
26 words
A dispenser for fluids according to claim 16, said body having a sealed forward end which may be selectively unsealed to enable dispensing of liquid therefrom.
Claim 24
Dependent Claim
48 words
A dispenser for fluids according to claim 21, said body comprising a syringe body member with a cylindrical bore therein and forming the first mentioned said bore, and said bore having a liquid containment section thereof between the forward end of said plunger and said sealed forward end.
Claim 25
Dependent Claim
106 words
Liquid filling and dispensing apparatus, comprising a liquid dispensing barrel having selectively effectively openable closed dispensing end, a liquid receiving chamber and a slidable plunger for effecting dispensing of liquid from said chamber through said dispensing end, said plunger having a normally closed pre-formed opening therein for selective external fluid communication with said chamber and a male fill member adapted to be inserted into and open said pre-formed opening and having a liquid flow passageway to enable filling of said chamber with liquid, said pre-formed opening being greater in effective opened cross-sectional peripheral size than the corresponding effective cross-sectional peripheral size of said male fill member.
Claim 26
Dependent Claim
106 words
Liquid filling and dispensing apparatus, comprising a liquid dispensing barrel having selectively effectively openable closed dispensing end, a liquid receiving chamber and a slidable plunger for effecting dispensing of liquid from said chamber through said dispensing end, said plunger having a normally closed pre-formed opening therein for selective external fluid communication with said chamber and a male fill member adapted to be inserted into and open said pre-formed opening and having a liquid flow passageway to enable filling of said chamber with liquid, said pre-formed opening being greater in effective opened cross-sectional peripheral size than the corresponding effective cross-sectional peripheral size of said male fill member.
Claim 27
Dependent Claim
30 words
Liquid filling and dispensing apparatus according to claim 23, said plunger being formed of self-recoverable elastic material adjacent and forming its said opening, said opening being a pre-formed self-closing slit.
Claim 28
Dependent Claim
23 words
Liquid filling and dispensing apparatus according to claim 24, said slit extending across the full extent of the forward face of said plunger.
Claim 29
Dependent Claim
22 words
Liquid filling and dispensing apparatus according to claim 24, said slit extending across a portion of the forward face of said plunger.
Claim 30
Dependent Claim
40 words
Liquid filling and dispensing apparatus according to claim 24, said plunger having a threaded screw-in recess in its rear external surface, and said slit being formed in a forward wall of said plunger defining the forward extent of said recess.
Claim 31
Dependent Claim
37 words
Liquid filling and dispensing apparatus according to claim 27, said fill member having a screw-in threaded male surface threadedly engageable with said threaded screw-in recess to assist in effecting entry into and opening of said pre-formed slit.
Claim 32
Dependent Claim
27 words
Liquid filling and dispensiNg apparatus according to claim 28, said fill member having a tubular extension section extending beyond the effective forward end of said threaded surface.
Claim 33
Dependent Claim
38 words
Liquid filling and dispensing apparatus according to claim 29, said fill member having an air bleed opening formed therein for assisting in air bleed past said fill member during liquid filling of said chamber through said fill member.
Claim 34
Dependent Claim
26 words
Liquid filling and dispensing apparatus according to claim 30, said air bleed opening including a longitudinal slot formed along an external surface of said fill member.
Claim 35
Dependent Claim
22 words
Liquid filling and dispensing apparatus according to claim 23, said fill member having connection means enabling connection thereof to a fill cylinder.
Claim 36
Dependent Claim
21 words
Liquid filling and dispensing apparatus according to claim 32, and a fill cylinder adapted to be connected to said fill member.
Claim 37
Dependent Claim
34 words
Liquid filling and dispensing apparatus according to claim 33, said fill cylinder comprising a fill syringe having a Luer nose-end connector, and said fill member having a Luer connector complementary to said nose-end connector.
Claim 38
Dependent Claim
34 words
Liquid filling and dispensing apparatus according to claim 23, said male fill member including a tube section having an outer circumference or periphery less than the effective opened cross-sectional peripheral size of said opening.
Claim 39
Dependent Claim
34 words
Liquid filling and dispensing apparatus according to claim 35, said opening being a slit and being longer than one half of the effective said outer circumference of periphery of said fill member tube section.
Claim 40
Dependent Claim
18 words
Liquid filling and dispensing apparatus according to claim 36, said tube section having a relatively blunt forward end.
Claim 41
Dependent Claim
20 words
Liquid filling and dispensing apparatus according to claim 36, said slit extending fully through a seal wall of said plunger.
Claim 42
Dependent Claim
70 words
Liquid filling and dispensing apparatus according to claim 36, said slit extending almost fully through a seal wall of said plunger and having a thin relatively easily ruptured connecting web membrane which does not require pointed instrument puncture or piercing to be opened but which may be sheared upon and by stretching thereof through thrusting motion thereagainst in the course of insertion of said male fill member into said slit.
Claim 43
Independent Claim
84 words
The method of filling a syringe body having a liquid-containment chamber with a rearwardly bounding manually operable plunger and a forward dispensing end spaced from the plunger, comprising opening a pre-formed self-closing valve in said plunger by insertion of a tubular member therein having a bore therethrough, and passing liquid through said bore while enabling air venting from said chamber past said tubular member at other than said bore, thereupon removing said tubular member from said valve and enabling the self-closure of said valve.
Claim 44
Independent Claim
84 words
The method of filling a syringe body having a liquid-containment chamber with a rearwardly bounding manually operable plunger and a forward dispensing end spaced from the plunger, comprising opening a pre-formed self-closing valve in said plunger by insertion of a tubular member therein having a bore therethrough, and passing liquid through said bore while enabling air venting from said chamber past said tubular member at other than said bore, thereupon removing said tubular member from said valve and enabling the self-closure of said valve.
Claim 45
Dependent Claim
64 words
The method according to claim 40, said valve being a pre-formed slit having opposing elastic lips which are biased into interengagement, and said opening of said valve being effected by insertion of said tubular member through said slit, to form an opening with a vent eye between said tubular member and the lips of said slit, said venting being effected through said vent eye.
Claim 46
Dependent Claim
29 words
The method according to claim 41, and subsequently connecting a handle to said plunger for dispensing of said liquid from said liquid-containment chamber and through said forward dispensing end.
Claim 47
Dependent Claim
61 words
The method according to claim 41, said plunger having a rear facing threaded connector section, and said insertion of said tubular member therein being effected by rotating and threadedly engaging said tubular member with said threaded connector to impart relative longitudinal joining motion between said tubular member and said plunger through the camming effect imparted by said rotation and threaded engagement.
Claim 48
Dependent Claim
22 words
The method according to claim 43, and subsequently connecting a handle to said plunger by threaded engagement wIth said threaded connector section.
Claim 49
Dependent Claim
24 words
The method according to claim 41, said insertion of said tubular member being effected by axial thrusting of said tubular member through said slit.
Claim 50
Dependent Claim
29 words
The method according to claim 45, and subsequently connecting a handle to said plunger for dispensing of said liquid from said liquid-containment chamber and through said forward dispensing end.
Claim 51
Dependent Claim
57 words
A fill member for a liquid containment body having an elastic plunger therein with a screw-threaded recess therein, said fill member, comprising a body having a screw-threaded exterior surface section, a forward tube extension section of less diameter than said screw-threaded section, and a fill bore extending longitudinally through said screw-threaded section and said forward tube extension.
Claim 52
Dependent Claim
57 words
A fill member for a liquid containment body having an elastic plunger therein with a screw-threaded recess therein, said fill member, comprising a body having a screw-threaded exterior surface section, a forward tube extension section of less diameter than said screw-threaded section, and a fill bore extending longitudinally through said screw-threaded section and said forward tube extension.
Claim 53
Dependent Claim
22 words
A fill member according to claim 47, and a vent opening formed in said body for venting past said screw threaded section.
Claim 54
Dependent Claim
22 words
A fill member according to claim 47, and a side slot formed along said screw-threaded section for venting past said screw-threaded section.
Claim 55
Dependent Claim
31 words
A fill member according to claim 47, and means on said body and spaced from said forward tube extension for connecting said fill member to a selected source of fill liquid.
Claim 56
Dependent Claim
18 words
A fill member according to claim 47, said forward tube extension being blunt nosed at its forward end.
Claim 57
Dependent Claim
33 words
A slidable plunger for a dispenser, comprising a cup-shaped body of elastic material having a slitted bottom, and a threaded female securing section formed along the internal annular wall of said sup-shaped body,
Claim 58
Dependent Claim
33 words
A slidable plunger for a dispenser, comprising a cup-shaped body of elastic material having a slitted bottom, and a threaded female securing section formed along the internal annular wall of said sup-shaped body,
Claim 59
Dependent Claim
21 words
A slidable plunger for a dispenser according to claim 52, said slitted bottom having a slit extending fully across said bottom.
References Cited (Backward Citations)
US3610297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |