Patent US644890A successfully refreshed from Google Patents.
Patent US3897672A successfully refreshed from Google Patents.
US3897672A
Expired / Lapsed
US
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Method of filling and pressurizing an aerosol can
Assignee: Individual
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Filing: 1974-09-11
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Granted: 1975-08-05
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Expires: 1994-09-11
Abstract
Abstract A viscous product to be dispensed is introduced through the top opening of a can into the region of the can above a piston slidable axially within the can. A valve assembly is placed in the opening, and a vacuum is applied to a hole in the bottom of the can to draw the product against the top of the piston. Fluid pressure is then applied to the hole in the bottom of the can to move the piston and product upwardly until the product completely fills the region of the can above the piston. The hole in the bottom of the can is then plugged. During application of vacuum and fluid pressure, air is permitted to flow into and out of the top of the can either by delaying fastening of the valve assembly to the can top or by temporarily opening the valve.
Inventors
- 👤 Christian T Scheindel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:36
CPC Classifications
B; B65; B65B; B65B3/00; B65B3/04; B65B3/10; B65B3/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
172 words
A method of filling and pressurizing a can having a top opening, a bottom wall formed with a hole, and a piston within the can and slidable along the axis of the can, the method comprising the steps of: a. introducing a product to be dispensed through the top opening of the can into the region of the can above the piston, b. placing a valve assembly into the top opening of the can, c. applying a vacuum to the hole in the bottom of the can while permitting air to flow into the can from the top to draw the product toward the top of the piston and thereby fill any voids between the product and piston, d. applying fluid pressure to the hole in the bottom of the can while permitting air to flow out of the top of the can to move the piston upwardly until the product completely fills the region of the can above the piston, and e. plugging the hole in the bottom of the can.
Claim 2
Independent Claim
172 words
A method of filling and pressurizing a can having a top opening, a bottom wall formed with a hole, and a piston within the can and slidable along the axis of the can, the method comprising the steps of: a. introducing a product to be dispensed through the top opening of the can into the region of the can above the piston, b. placing a valve assembly into the top opening of the can, c. applying a vacuum to the hole in the bottom of the can while permitting air to flow into the can from the top to draw the product toward the top of the piston and thereby fill any voids between the product and piston, d. applying fluid pressure to the hole in the bottom of the can while permitting air to flow out of the top of the can to move the piston upwardly until the product completely fills the region of the can above the piston, and e. plugging the hole in the bottom of the can.
Claim 3
Dependent Claim
82 words
A method as defined in claim 1 wherein the valve assembly is seated on the can edge surrounding the top opening but is not fastened to that edge during step (b), whereby air can flow into and out of the top of the can between said edge and the valve assembly during steps (c) and (d), respectively, and including the step of fastening the valve assembly in an air-tight manner to the can edge surrounding the top opening subsequent to step (d).
Claim 4
Dependent Claim
58 words
A method as defined in claim 2 including the step of limiting the movement of the valve assembly away from the can edge surrounding the top opening, so that air is permitted to flow out of the can between that edge and the valve assembly but none of the product is permitted to flow out of the can.
Claim 5
Dependent Claim
37 words
A method as defined in claim 1 including the step of opening the valve of the valve assembly during steps (c) and (d) to permit air to flow into the can and out of the can, respectively.
Claim 6
Dependent Claim
38 words
A method as defined in claim 4 wherein the valve is opened very slightly during step (d) so as to permit air to flow through it but not to permit any of the product to flow through it.
Claim 7
Dependent Claim
31 words
A method as defined in claim 1 including the step of providing a seal between the hole in the bottom of the can and the atmosphere during steps (c) and (d).
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |