PATENT CLAIM ANALYSIS

Application Number: 16059612
Application Type: Utility
Filing Date: 2018-08
Publication Date: 2018-12
Patent Classification: ["222", "190000"]

Abstract:
A piston pump for dispensing fluid from a reservoir, an improved vacuum relief arrangement in which a passageway for flow of air from the atmosphere into the reservoir is provided at least in part through a piston-forming element of the piston pump.

Claim (Index 20):
A piston pump for dispensing from a discharge outlet a liquid from a reservoir admixed with air,\n the pump comprising: a piston chamber-forming member disposed about an axis, the piston chamber-forming member having an outer tubular member and a center post member coaxial about the axis with an annular end wall joining an inner end of the outer tubular member and an axially inner end of the center post member, the outer tubular member extending axially outwardly from the end wall to an open outer end of the outer tubular member, the center post member extending axially outwardly from the end wall along an axial extent to a closed outer end of the center post member, the piston chamber-forming member defining a chamber therein within the outer tubular member open axially outwardly at the open outer end of the outer tubular member, the chamber including an annular inner portion between the outer tubular member and the center post member along the axial extent of the center post member, a piston-forming element having a hollow central axially extending stem, the stem having a central passageway through the stem from an axial inner end of the stem to the discharge outlet at an axial outer end of the stem, the stem having a plurality of axially spaced annular members which extend radially outwardly from the stem, the stem of the piston-forming element coaxially slidably received in the chamber of the piston chamber-forming member with the center post member extending axially into the central passageway of the stem through the axial inner end of the stem and the annular members extending radially outwardly from the stem towards the outer tubular member; a flow space defined within the central passageway between the center post member and the stem providing an axial passage for fluid between the center post member and the stem, the piston-forming element coaxially slidably received in the piston chamber-forming member for reciprocal axial inward and outward movement in a cycle of operation between an extended position and a retracted position, the cycle of operation including a retraction stroke from the extended position to the retracted position and an extension stroke from the retracted position to the extended position, a pair of the annular members on the stem cooperating with axially spaced portions of the outer tubular member of different diameters to provide a variable volume liquid compartment of a stepped chamber liquid piston pump which in cycle of operation draws fluid from the reservoir for discharge into the flow space, which variable volume liquid compartment has its volume vary cyclically with movement of the piston-forming element between the retracted position and the extended position in a cycle of operation, at least one of the annular members on the stem axially outwardly of the pair of the annular members cooperating with the tubular member to provide within the chamber a variable volume air compartment of an air piston pump which variable volume air compartment has its volume vary cyclically with movement of the piston-forming element between the retracted position and the extended position in a cycle of operation, a channel extending radially from an outlet in the passageway wall through the passageway wall of the stem to connect the air compartment with the flow space, the air pump in the cycle of operation drawing air from the atmosphere into the air compartment from the discharge outlet via the passageway, the flow space and the channel and discharging air from the air compartment via the channel into the flow space and through the passageway to out the discharge outlet, in a cycle of operation, the liquid pump and the air pump are operative to simultaneously discharge the liquid and air axially outwardly past or through the outlet through the flow space to the discharge outlet, the flow space providing about the outlet of the channel a restriction to flow axially through the flow space which increases the velocity of fluid flowing axially outwardly through the flow space and assists in increasing the mixing of the air with liquid in the restriction of the flow space.

Metadata:
- Claim Count in Document: 47.0
- Percentile: 96.0
- Lexical Diversity: 1.33333
- Patent Class: 222.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15106720', '11145221', '15709731', '14607503', '12457476']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7958413614066538
- 35 USC 102 Novelty (BERT): 0.5982310612048161
- Combined Prediction Score: 0.77608033138647
- Mean Citation Score: 433.007256
- Max Citation Score: 532.1684
- Similarity Product: 480.9565500827789

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test