US4278189A — Accumulative pressure pump

Claim 1

Independent Claim 220 words

In a pump dispenser adapted to be attached to a container holding a liquid to be dispensed, the combination comprising: (a) means defining a cylindrical pump body having a first section and a second section, said second section being of a smaller diameter than said first section; (b) a first piston received in said first body section and having an attached first stem means having a fluid passage therein extending out of said body section; (c) a second piston received in said second body section and having an attached second stem means having a fluid passage in its lower portion and a solid upper portion normally contacting said first stem means to close the fluid passage therein; (d) a dip tube means having its upper portion passing through an opening of larger diameter than said dip tube that is provided in the lower end of said second body section, the dip tube upper end being coupled to said second piston and movable therewith; and (e) means provided on the wall of said second body section to cooperate with said second piston to permit air entrapped in said first and second body sections to be discharged through the opening in the lower end of said second body section into the air space of said container upon the priming of the pump.

Claim 2

Dependent Claim 220 words

In a pump dispenser adapted to be attached to a container holding a liquid to be dispensed, the combination comprising: (a) means defining a cylindrical pump body having a first section and a second section, said second section being of a smaller diameter than said first section; (b) a first piston received in said first body section and having an attached first stem means having a fluid passage therein extending out of said body section; (c) a second piston received in said second body section and having an attached second stem means having a fluid passage in its lower portion and a solid upper portion normally contacting said first stem means to close the fluid passage therein; (d) a dip tube means having its upper portion passing through an opening of larger diameter than said dip tube that is provided in the lower end of said second body section, the dip tube upper end being coupled to said second piston and movable therewith; and (e) means provided on the wall of said second body section to cooperate with said second piston to permit air entrapped in said first and second body sections to be discharged through the opening in the lower end of said second body section into the air space of said container upon the priming of the pump.

Claim 3

Dependent Claim 37 words

In the pump dispenser of claim 1, wherein spring means are provided in said first body section, the upper end of said means being coupled to said second stem means at a point above said second piston.

Claim 4

Dependent Claim 34 words

In the pump dispenser of claim 1 wherein said pump body has a cylindrical flange at its upper end and a closure means received over said flange for attaching said pump to said container.

Claim 5

Dependent Claim 26 words

In the pump of claim 3 wherein said closure means includes cap means for attaching said pump to a neck that is provided on said container.

Claim 6

Dependent Claim 14 words

In the pump of claim 3 wherein said closure means includes a ferrule means.

Claim 7

Dependent Claim 40 words

In the pump of claim 5 wherein said ferrule means includes a central upstanding pedestal portion which encloses a collar means slidably surrounding a part of said first stem means and abutting said first piston to limit its upward movement.

Claim 8

Dependent Claim 200 words

In a pump dispenser adapted to be attached to a container having a bottom and an upstanding sidewall and holding a liquid to be dispensed, the combination comprising: (a) means defining a cylindrical pump chamber having an upper, larger diameter section and a lower, smaller diameter section; (b) an upper piston and a lower piston received in their respective chamber sections, each of said pistons having hollow stem means attached thereto; (c) resilient means biasing both of said pistons upwardly, said pistons being reciprocatable by downward pressure on said upper piston stem means and release of said pressure; (d) a flexible dip tube having its upper end coupled to said lower piston and extending through an opening provided in said lower pump chamber section; and (e) said dip tube having its lower end adjacent to or in contact with the bottom wall of the container and being movable across said bottom wall to insure that said lower end extends into the immediate area of the intersection of the bottom wall and sidewall of the container when said lower piston is moved from its uppermost to its lowermost position to permit dispensing of substantially the entire liquid contents of the container.

Claim 9

Dependent Claim 200 words

In a pump dispenser adapted to be attached to a container having a bottom and an upstanding sidewall and holding a liquid to be dispensed, the combination comprising: (a) means defining a cylindrical pump chamber having an upper, larger diameter section and a lower, smaller diameter section; (b) an upper piston and a lower piston received in their respective chamber sections, each of said pistons having hollow stem means attached thereto; (c) resilient means biasing both of said pistons upwardly, said pistons being reciprocatable by downward pressure on said upper piston stem means and release of said pressure; (d) a flexible dip tube having its upper end coupled to said lower piston and extending through an opening provided in said lower pump chamber section; and (e) said dip tube having its lower end adjacent to or in contact with the bottom wall of the container and being movable across said bottom wall to insure that said lower end extends into the immediate area of the intersection of the bottom wall and sidewall of the container when said lower piston is moved from its uppermost to its lowermost position to permit dispensing of substantially the entire liquid contents of the container.

Claim 10

Dependent Claim 19 words

In the pump dispenser of claim 7 wherein the pump is attached to a container having a flat bottom.

Claim 11

Dependent Claim 14 words

In the pump dispenser of claim 8 wherein said container has a convex bottom.

Claim 12

Dependent Claim 14 words

In the pump dispenser of claim 9 wherein said container is a glass container.

Claim 13

Dependent Claim 14 words

In the pump dispenser of claim 9 wherein said container is a metal container.

Claim 14

Dependent Claim 14 words

In the pump dispenser of claim 9 wherein said container is a plastic container.

Claim 15

Dependent Claim 14 words

In the pump dispenser of claim 8 wherein said container is a glass container.

Claim 16

Dependent Claim 14 words

In the pump dispenser of claim 8 wherein said container is a metal container.

Claim 17

Dependent Claim 14 words

In the pump dispenser of claim 8 wherein said container is a plastic container.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-07-13	1985-01-12	1985-07-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-07-13	1989-01-12	1989-07-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-07-13	1993-01-12	1993-07-14	$7700.00	Window Closed / Lapsed

Accumulative pressure pump

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