Patent US3858764A successfully refreshed from Google Patents.
US3858764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized dispensers
Assignee: Wilkinson Sword Ltd
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Filing: 1973-02-12
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Granted: 1975-01-07
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Expires: 1993-02-12
Abstract
Abstract As the contents of a pressurized dispenser are used up, the pressure within the dispenser container falls, resulting, for example, in the case of a foam dispenser in an undesirable change in the foam consistency, density and other properties. By the provision of a reservoir within the dispenser made of a substance capable of forming a solution with the propellant being employed, a controlled release of propellant in the dispenser is obtained as the contents are expressed to thereby maintain desirable foam consistency, density and other properties.
Inventors
- 👤 Hugh R Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:51
CPC Classifications
B; B65; B65D; B65D83/00; B65D83/14; B65D83/38; B65D83/60; B65D83/673
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
97 words
A pressurized dispenser comprising a container provided with a valve-controlled outlet and containing a concentrate, and a reservoir holding propellant, positioned within the container, the reservoir comprising an organic substance with which the propellant forms a solution and over which the vapor pressure of the dissolved propellant is less than that of the pure propellant, the organic substance being capable of forming a solution with at least 15 percent of its own weight of propellant at room temperature, and the reservoir being capable of releasing propellant within the container as the contents of the container are dispensed.
Claim 2
Dependent Claim
97 words
A pressurized dispenser comprising a container provided with a valve-controlled outlet and containing a concentrate, and a reservoir holding propellant, positioned within the container, the reservoir comprising an organic substance with which the propellant forms a solution and over which the vapor pressure of the dissolved propellant is less than that of the pure propellant, the organic substance being capable of forming a solution with at least 15 percent of its own weight of propellant at room temperature, and the reservoir being capable of releasing propellant within the container as the contents of the container are dispensed.
Claim 3
Dependent Claim
29 words
A dispenser according to claim 1 wherein the reservoir is enclosed within a capsule pervious to propellant, said capsule confining therein a mobile solution of said substance and propellant.
Claim 4
Dependent Claim
85 words
A dispenser for discharging a product under pressure comprising a container having therein a reservoir for propellant, the reservoir being made of a solid organic polymeric substance which is capable of forming a solution with at least 15 percent of its own weight of propellant at room temperature, the vapor pressure of the dissolved propellant over the solution being thus reduced below that of pure propellant, and the reservoir being capable of releasing propellant within the container as the contents of the container are dispensed.
Claim 5
Dependent Claim
85 words
A dispenser for discharging a product under pressure comprising a container having therein a reservoir for propellant, the reservoir being made of a solid organic polymeric substance which is capable of forming a solution with at least 15 percent of its own weight of propellant at room temperature, the vapor pressure of the dissolved propellant over the solution being thus reduced below that of pure propellant, and the reservoir being capable of releasing propellant within the container as the contents of the container are dispensed.
Claim 6
Dependent Claim
18 words
A dispenser according to claim 3 wherein the container contains a liquid mixture of a concentrate and propellant.
Claim 7
Dependent Claim
32 words
A dispenser according to claim 3 wherein the reservoir is a solid mass of the substance in which the propellant is dissolved and forms a part of a component of the dispenser.
Claim 8
Dependent Claim
31 words
A dispenser according to claim 3 wherein the reservoir is a solid mass of the substance in which the propellant is dissolved and is mounted on a component of the dispenser.
Claim 9
Dependent Claim
31 words
A dispenser according to claim 3 wherein the reservoir is a solid mass of the substance in which the propellant is dissolved and is coated on a component of the container.
Claim 10
Dependent Claim
12 words
A dispenser according to claim 3 wherein the substance is a polyisoprene.
Claim 11
Dependent Claim
12 words
A dispenser according to claim 3 wherein the substance is a polyurethane.
Claim 12
Dependent Claim
14 words
A dispenser according to claim 3 wherein the substance is an ethylene/vinyl acetate copolymer.
Claim 13
Dependent Claim
13 words
A dispenser according to claim 3 wherein the substance is a silicone rubber.
Claim 14
Dependent Claim
13 words
A dispenser according to claim 3 wherein the substance is a hydrocarbon rubber.
Claim 15
Dependent Claim
16 words
A dispenser according to claim 3 wherein the substance is a copolymer of isoprene and styrene.
Claim 16
Dependent Claim
16 words
A dispenser according to claim 3 wherein the substance is a copolymer of butadiene and styrene.
Claim 17
Dependent Claim
104 words
A pressurized dispenser component in the form of a valve and dip tube assembly for a container, said component having at least a part thereof made of a solid organic polymeric substance capable of forming a non-fluid solution with at least 15 percent of its own weight of propellant at rOom temperature when placed in a dispenser container in contact with propellant, said substance thereby forming a propellant reservoir over which the vapor pressure of the dissolved propellant is less than that of the pure propellant, said reservoir being capable of releasing propellant in response to a reduction in gaseous pressure within the container.
Claim 18
Dependent Claim
104 words
A pressurized dispenser component in the form of a valve and dip tube assembly for a container, said component having at least a part thereof made of a solid organic polymeric substance capable of forming a non-fluid solution with at least 15 percent of its own weight of propellant at rOom temperature when placed in a dispenser container in contact with propellant, said substance thereby forming a propellant reservoir over which the vapor pressure of the dissolved propellant is less than that of the pure propellant, said reservoir being capable of releasing propellant in response to a reduction in gaseous pressure within the container.
Claim 19
Independent Claim
96 words
A method of manufacture of a valve-controlled pressurized dispenser which comprises introducing into a dispenser container a reservoir consisting of an organic substance, said substance being capable of forming a solution with at least 15 percent of its own weight of propellant at room temperature, the vapor pressure of the dissolved propellant over the solution being less than that of pure propellant, and the reservoir being capable of releasing dissolved propellant to reduce the fall in pressure in the head space of the container which would otherwise occur as the contents of the container are dispensed.
Claim 20
Independent Claim
96 words
A method of manufacture of a valve-controlled pressurized dispenser which comprises introducing into a dispenser container a reservoir consisting of an organic substance, said substance being capable of forming a solution with at least 15 percent of its own weight of propellant at room temperature, the vapor pressure of the dissolved propellant over the solution being less than that of pure propellant, and the reservoir being capable of releasing dissolved propellant to reduce the fall in pressure in the head space of the container which would otherwise occur as the contents of the container are dispensed.
Claim 21
Dependent Claim
18 words
A method according to claim 16 wherein the reservoir is charged with propellant before introduction into the container.
Claim 22
Dependent Claim
86 words
A pressurized dispenser comprising a container having a valve-controlled outlet and containing a liquid concentrate and propellant mixture in a ratio to be dispensed, and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing sufficient propellant to substantially maintain said liquid concentrate and propellant mixture ratio at least until a substantial portion of the concentrate has been dispensed.
Claim 23
Dependent Claim
86 words
A pressurized dispenser comprising a container having a valve-controlled outlet and containing a liquid concentrate and propellant mixture in a ratio to be dispensed, and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing sufficient propellant to substantially maintain said liquid concentrate and propellant mixture ratio at least until a substantial portion of the concentrate has been dispensed.
Claim 24
Dependent Claim
90 words
A pressurized dispenser for foam comprising a container having a valve-controlled outlet and containing a concentrate and propellant mixture to be dispensed as a foam, and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing sufficient propellant to maintain the density of the foam dispensed substantially uniform over the period until at least a substantial portion of the concentrate has been dispensed.
Claim 25
Dependent Claim
90 words
A pressurized dispenser for foam comprising a container having a valve-controlled outlet and containing a concentrate and propellant mixture to be dispensed as a foam, and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing sufficient propellant to maintain the density of the foam dispensed substantially uniform over the period until at least a substantial portion of the concentrate has been dispensed.
Claim 26
Dependent Claim
83 words
A pressurized dispenser employing a gaseous propellant to provide a predetermined driving pressure to dispense a concentrate which comprises a container having a valve-controlled outlet and containing a concentrate and gaseous propellant, and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing propellant to provide a supplemental source to substantially maintain the predetermined driving pressure.
Claim 27
Dependent Claim
83 words
A pressurized dispenser employing a gaseous propellant to provide a predetermined driving pressure to dispense a concentrate which comprises a container having a valve-controlled outlet and containing a concentrate and gaseous propellant, and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing propellant to provide a supplemental source to substantially maintain the predetermined driving pressure.
Claim 28
Dependent Claim
93 words
A pressurized dispenser employing a gaseous propellant to provide a driving pressure to dispense a powder concentrate which comprises a container having a valve-controlled outlet and containing a powder concentrate to be dispensed, and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing more gaseous propellant than is present in a volume of the pressurized gaseous propellant equivalent to the volume occupied by the reservoir.
Claim 29
Dependent Claim
93 words
A pressurized dispenser employing a gaseous propellant to provide a driving pressure to dispense a powder concentrate which comprises a container having a valve-controlled outlet and containing a powder concentrate to be dispensed, and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing more gaseous propellant than is present in a volume of the pressurized gaseous propellant equivalent to the volume occupied by the reservoir.
Claim 30
Independent Claim
128 words
A method for assembling a pressurized dispenser for expelling a concentrate product, the dispenser including a container having a valve-controlled outlet and containing the concentrate product and a predetermined amount of a propellant, which comprises inserting into the container a reservoir comprising an organic substance capable of holding propellant in solution with the vapor pressure over the dissolved propellant being leSs than that of the pure propellant, the reservoir being further capable of forming a solution with at least 15 percent of its own weight of propellant at room temperature, charging the container with the concentrate and propellant, the amount of the propellant being in excess of the predetermined amount, and allowing the reservoir to form a solution of at least a substantial portion of the excess propellant.
Claim 31
Independent Claim
128 words
A method for assembling a pressurized dispenser for expelling a concentrate product, the dispenser including a container having a valve-controlled outlet and containing the concentrate product and a predetermined amount of a propellant, which comprises inserting into the container a reservoir comprising an organic substance capable of holding propellant in solution with the vapor pressure over the dissolved propellant being leSs than that of the pure propellant, the reservoir being further capable of forming a solution with at least 15 percent of its own weight of propellant at room temperature, charging the container with the concentrate and propellant, the amount of the propellant being in excess of the predetermined amount, and allowing the reservoir to form a solution of at least a substantial portion of the excess propellant.
Claim 32
Dependent Claim
76 words
A pressurized dispenser for dispensing only a gaseous propellant comprising a container having a valve-controlled outlet and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing more gaseous propellant than is present in a volume of the pressurized gaseous propellant equivalent ot the volume occupied by the reservoir.
Claim 33
Dependent Claim
76 words
A pressurized dispenser for dispensing only a gaseous propellant comprising a container having a valve-controlled outlet and a reservoir positioned within the container and comprising an organic substance holding propellant in solution with the vapor pressure over the dissolved propellant being less than that of the pure propellant, the reservoir being capable of releasing more gaseous propellant than is present in a volume of the pressurized gaseous propellant equivalent ot the volume occupied by the reservoir.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |