US3826412A
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: 1972-07-26
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Granted: 1974-07-30
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Expires: 1992-07-26
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 centrally located area of the bottom will evert at a pressure of 170 to 200 p.s.i. so as to rupture the bottom at the source 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
2026-10-28 02:45
CPC Classifications
B; B65; B65D; B65D83/00; B65D83/14; B65D83/70; 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: 24
Claim 1
Independent Claim
155 words
An aerosol can comprising a side wall portion, a top portion adapted to receive a valve assembly including a valve cup, and a steel bottom portion, said bottom portion having a peripheral concave area, a centrally located substantially flat area connected to and integrally formed therewith and substantially less resistant to internal deforming pressures than said peripheral concave area, and a pressure release valve formed by a plurality of intersecting score lines located on said flat area, said flat area deforming outwardly at a pressure in excess of 170 p.s.i., but below 200 p.s.i. with resulting rupturing of said bottom portion substantially limited to a point of intersection of said score lines located substantially centrally in said flat area so as to release the contents of said can through a small opening created by said rupturing, said flat area deforming outwardly before rupturing at said point of intersection without substantial everting of said concave area.
Claim 2
Dependent Claim
155 words
An aerosol can comprising a side wall portion, a top portion adapted to receive a valve assembly including a valve cup, and a steel bottom portion, said bottom portion having a peripheral concave area, a centrally located substantially flat area connected to and integrally formed therewith and substantially less resistant to internal deforming pressures than said peripheral concave area, and a pressure release valve formed by a plurality of intersecting score lines located on said flat area, said flat area deforming outwardly at a pressure in excess of 170 p.s.i., but below 200 p.s.i. with resulting rupturing of said bottom portion substantially limited to a point of intersection of said score lines located substantially centrally in said flat area so as to release the contents of said can through a small opening created by said rupturing, said flat area deforming outwardly before rupturing at said point of intersection without substantial everting of said concave area.
Claim 3
Dependent Claim
14 words
The aerosol can of claim 1 wherein each of said score lines is linear.
Claim 4
Dependent Claim
26 words
The aerosol can of claim 2 wherein said score lines include pairs of lines located on diametrically opposite sides of a point on said flat area.
Claim 5
Dependent Claim
17 words
The aerosol can of claim 3 wherein said score lines are located entirely within said flat area.
Claim 6
Dependent Claim
18 words
The aerosol can of claim 4 wherein said score lines consist of six equally angularly spaced score lines.
Claim 7
Dependent Claim
18 words
The aerosol can of claim 4 wherein said score lines consist of eight equally angularly spaced score lines.
Claim 8
Dependent Claim
51 words
The aerosol can of claim 1 wherein each said score line is a compound score line including a rough score line and a finished score line within said rough score line, said bottom portion having a residual thickness of 0.002 to 0.005 inches at the base of said fine score line.
Claim 9
Dependent Claim
32 words
The aerosol can of claim 1 wherein each of said score lines has a lesser residual thickness near the center of the flat area than at the edge of the flat area.
Claim 10
Dependent Claim
25 words
The aerosol can of claim 1 wherein the maximum diameter of said flat area is less than one third the diameter of said bottom portion.
Claim 11
Dependent Claim
43 words
The aerosol can of claim 2 comprising a series of arcuate score lines located radially outwardly from said point of intersection in a broken circular array, each of said arcuate score lines being located between each adjacent pair of said linear score lines.
Claim 12
Dependent Claim
29 words
The aerosol can of claim 10 wherein the ends of said arcuate score lines are spaced a substantial distance from each said adjacent pair of said linear score lines.
Claim 13
Dependent Claim
22 words
The aerosol can of claim 11 wherein said arcuate score lines are substantially aligned with the ends of said linear score lines.
Claim 14
Dependent Claim
20 words
The aerosol can of claim 12 comprising five of said linear score lines and five of said arcuate score lines.
Claim 15
Dependent Claim
127 words
An aerosol can comprising a side wall portion, a top portion adapted to receive a valve assembly including a valve cup, and a steel bottom portion, said bottom portion having a peripheral concave area, a centrally located bubble-like area integrally formed with said peripheral concave area and substantially circumscribed by a score line, said buble-like area having a lesser radius of curvature than said peripheral concave area, and a pressure release valve formed by a plurality of intersecting score lines located within said bubble-like area, said bubble-like area everting at a pressure in excess of 170 p.s.i. with resulting rupturing of said bottom portion at the intersection of said score lines so as to release the contents of said can through an opening created by said rupturing.
Claim 16
Dependent Claim
127 words
An aerosol can comprising a side wall portion, a top portion adapted to receive a valve assembly including a valve cup, and a steel bottom portion, said bottom portion having a peripheral concave area, a centrally located bubble-like area integrally formed with said peripheral concave area and substantially circumscribed by a score line, said buble-like area having a lesser radius of curvature than said peripheral concave area, and a pressure release valve formed by a plurality of intersecting score lines located within said bubble-like area, said bubble-like area everting at a pressure in excess of 170 p.s.i. with resulting rupturing of said bottom portion at the intersection of said score lines so as to release the contents of said can through an opening created by said rupturing.
Claim 17
Dependent Claim
18 words
The aerosol can of claim 14 wherein said score lines consist of eight equally angularly spaced score lines.
Claim 18
Dependent Claim
17 words
The aerosol can of claim 14 wherein said score line ciRcumscribing said bubble-like area is substantially circular.
Claim 19
Dependent Claim
25 words
The aerosol can of claim 16 wherein the maximum diameter of said bubble-like area is less than one third the diameter of said bottom portion.
Claim 20
Dependent Claim
141 words
An aerosol can comprising a steel side wall portion, a top portion adapted to receive a valve assembly including a valve cup, and a steel domed bottom portion, said bottom portion including a steel concave peripheral area and a steel central area integral with said peripheral area and having a lesser resistance to internal deforming forces than said peripheral area, said central area having score lines intersecting in a region located substantially inwardly from said concave peripheral area, said central area deforming outwardly at a predetermined pressure while said peripheral area remains concave and substantially undeformed, said scored region rupturing at a point of intersection of said score lines after and as a result of the outward deformation of said central area without any substantial rupturing along the length of said score lines or substantial outward deformation of said peripheral area.
Claim 21
Dependent Claim
141 words
An aerosol can comprising a steel side wall portion, a top portion adapted to receive a valve assembly including a valve cup, and a steel domed bottom portion, said bottom portion including a steel concave peripheral area and a steel central area integral with said peripheral area and having a lesser resistance to internal deforming forces than said peripheral area, said central area having score lines intersecting in a region located substantially inwardly from said concave peripheral area, said central area deforming outwardly at a predetermined pressure while said peripheral area remains concave and substantially undeformed, said scored region rupturing at a point of intersection of said score lines after and as a result of the outward deformation of said central area without any substantial rupturing along the length of said score lines or substantial outward deformation of said peripheral area.
Claim 22
Dependent Claim
133 words
An aerosol can comprising a side wall portion, a top portion adapted to receive a valve assembly including a valve cup, and a steel bottom portion, said bottom portion having a peripheral concave area characterized by a first radius of curvature and a centrally located concave valve area characterized by a second radius of curvature different from said first radius of curvature, said concave valve area comprising a plurality of intersecting score lines everting at a pressure in excess of 170 p.s.i. and less than 200 p.s.i. with resulting rupturing of said bottom portion at the intersection of said score lines after said everting of said concave valve area so as to release the contents of said can through an opening created by said rupturing without substantial everting of said peripheral concave area.
Claim 23
Dependent Claim
133 words
An aerosol can comprising a side wall portion, a top portion adapted to receive a valve assembly including a valve cup, and a steel bottom portion, said bottom portion having a peripheral concave area characterized by a first radius of curvature and a centrally located concave valve area characterized by a second radius of curvature different from said first radius of curvature, said concave valve area comprising a plurality of intersecting score lines everting at a pressure in excess of 170 p.s.i. and less than 200 p.s.i. with resulting rupturing of said bottom portion at the intersection of said score lines after said everting of said concave valve area so as to release the contents of said can through an opening created by said rupturing without substantial everting of said peripheral concave area.
Claim 24
Dependent Claim
27 words
The aerosol can of claim 19 wherein said concave valve area and said score lines substantially limit the rupturing of said score lines to the intersection thereof.
References Cited (Backward Citations)
GB748953A
Cited
US2951614A
Cited
US3292826A
Cited
US3388601A
Cited
US3356257A
Cited
US3515308A
Cited
US3622051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |