US3815534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure release valves for aerosol cans
Assignee: Crown Cork and Seal Co Inc
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Filing: 1971-11-18
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Granted: 1974-06-11
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Expires: 1991-11-18
Abstract
Abstract A pressure release valve is located in the domed bottom of an aerosol can. A centrally located area in the domed bottom having a lesser resistance to eversion than the peripheral area in the domed bottom includes several score lines which meet at a common point in a spoke-like configuration. The flat area of the bottom will evert at a pressure of 170 to 200 p.s.i. so as to rupture the bottom at the score lines before any substantial eversion of the peripheral area occurs.
Inventors
- 👤 R Kneusel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:30
CPC Classifications
B; B65; B65D; B65D83/00; B65D83/14; B65D83/70; B05; B05B; B05B15/00; B05B15/14; B21; B21D; B21D51/00; B21D51/16; B21D51/24; F; F17; F17C; F17C13/00; F17C13/12; F17C13/123; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2201/0114; F17C2201/03; F17C2201/035; F17C2201/05; F17C2201/058; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0311; F17C2205/0314; F17C2205/0323; F17C2205/0329; F17C2205/0332; F17C2205/0388; F17C2205/0394; F17C2205/0397; F17C2260/00; F17C2260/04; F17C2260/042; F17C2270/00; F17C2270/07; F17C2270/0718
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A method of making an aerosol container having a pressure release valve comprising the steps of: deforming an outwardly concave container bottom blank so as to form a relatively flat central portion therein; scoring said relatively flat central portion of said blank so as to form intersecting score lines; and double seaming said domed container bottom to a container body with the dome of said deformed and scored central portion extending upwardly into said container body such that said deformed and scored central portion of said container bottom has a lesser resistance to eversion resulting from pressure within said container than the portion of said container bottom surrounding said substantially flat and scored central portion.
Claim 2
Independent Claim
115 words
A method of making an aerosol container having a pressure release valve comprising the steps of: deforming an outwardly concave container bottom blank so as to form a relatively flat central portion therein; scoring said relatively flat central portion of said blank so as to form intersecting score lines; and double seaming said domed container bottom to a container body with the dome of said deformed and scored central portion extending upwardly into said container body such that said deformed and scored central portion of said container bottom has a lesser resistance to eversion resulting from pressure within said container than the portion of said container bottom surrounding said substantially flat and scored central portion.
Claim 3
Dependent Claim
44 words
The method of claim 1 wherein said scoring comprises the steps of forming a rough score line in said relatively flat portion and subsequently forming a fine score line at the base of said rough score line leaving a residual thickness of 0.002-0.005 inches.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said scoring occurs substantially simultaneously with the deforming of said relatively flat portion of said container bottom blank.
Claim 5
Independent Claim
138 words
A method of making an aerosol container having a pressure release valve comprising the steps of: forming a container bottom from a flat metallic member so as to have a pressure resistant peripheral portion formed from said member and a less pressure resistant and more centally located portion substantially surrounded by said peripheral portion, said less pressure resistant portion also being formed from said flat metallic member; scoring said less pressure resistant portion of said member so as to form intersecting score lines; double seaming said container bottom to a container body with said outwardly concave portion and said scored centrally located portion extending into said container body, said score lines being formed so as to rupture upon deformation of said less pressure resistant and more centrally located portion and before deformation of said pressure resistant peripheral portion.
Claim 6
Independent Claim
138 words
A method of making an aerosol container having a pressure release valve comprising the steps of: forming a container bottom from a flat metallic member so as to have a pressure resistant peripheral portion formed from said member and a less pressure resistant and more centally located portion substantially surrounded by said peripheral portion, said less pressure resistant portion also being formed from said flat metallic member; scoring said less pressure resistant portion of said member so as to form intersecting score lines; double seaming said container bottom to a container body with said outwardly concave portion and said scored centrally located portion extending into said container body, said score lines being formed so as to rupture upon deformation of said less pressure resistant and more centrally located portion and before deformation of said pressure resistant peripheral portion.
Claim 7
Dependent Claim
39 words
The method of claim 4 wherein said step of forming comprises: forming said pressure resistant peripheral portIon so as to be outwardly concave and forming said less pressure resistant, more centrally located portion so as to be relatively flat.
Claim 8
Dependent Claim
43 words
The method of claim 5 wherein said step of scoring comprises forming a rough score line in said more centrally located portion and forming a fine score line in the base of said rough score line leaving a residual thickness of 0.002-0.005 inches.
Claim 9
Dependent Claim
66 words
The method of claim 5 wherein said step of forming comprises forming said metallic member so as to form a relatively flat less pressure resistant and more centrally located portion; said method further comprising the step of deforming said relatively flat more centrally located portion after scoring so as to create a concave bulge having a radius of curvature less than said pressure resistant peripheral portion.
Claim 10
Dependent Claim
23 words
The method of claim 7 wherein said relatively flat portion is scored so as to form a score line along the periphery thereof.
Claim 11
Independent Claim
74 words
A method of making an aerosol container having a pressure release valve comprising the following operations: weakening an integral metallic valve portion of a metallic concave container bottom blank so as to deform at a pressure relatively less than the pressure required to evert concave portions of said blank adjacent said valve portion; and scoring said weakened metallic valve portion so as to form intersecting score lines rupturing as said valve portion is deformed.
Claim 12
Independent Claim
74 words
A method of making an aerosol container having a pressure release valve comprising the following operations: weakening an integral metallic valve portion of a metallic concave container bottom blank so as to deform at a pressure relatively less than the pressure required to evert concave portions of said blank adjacent said valve portion; and scoring said weakened metallic valve portion so as to form intersecting score lines rupturing as said valve portion is deformed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |