US4789608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure venting device
Assignee: Saft America Inc
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Filing: 1987-03-26
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Granted: 1988-12-06
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Expires: 2007-03-26
Abstract
Abstract A pressure venting device for a battery casing includes two semi-circular concavities extending upwardly from the bottom surface of the casing, two oppositely disposed bridges interrupting the concavities and two weakening or score lines disposed laterally and offset from the bridges. Since the score lines are formed in a flat area of the bottom surface of the battery casing, venting will occur consistently at a predetermined pressure range.
Inventors
- 👤 John A. Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:17
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/30; H01M50/342; H01M50/3425; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A vent pressure device for a substantially cylindrical container, said device comprising: at least two arcuate concavities formed in one end of the container, said concavities extending upwardly into the interior of the container; at least two diametrically opposed bridges formed in the one end of the container which interrupt said at least two arcuate concavities; and at least two diametrically opposed score lines formed in the one end of the container, said score lines being disposed laterally and interiorly offset relative to each of said at least two bridges and being disposed to span across an area so as to contact two of said at least two arcuate concavities.
Claim 2
Dependent Claim
110 words
A vent pressure device for a substantially cylindrical container, said device comprising: at least two arcuate concavities formed in one end of the container, said concavities extending upwardly into the interior of the container; at least two diametrically opposed bridges formed in the one end of the container which interrupt said at least two arcuate concavities; and at least two diametrically opposed score lines formed in the one end of the container, said score lines being disposed laterally and interiorly offset relative to each of said at least two bridges and being disposed to span across an area so as to contact two of said at least two arcuate concavities.
Claim 3
Dependent Claim
17 words
The device as in claim 1, wherein the residual thickness of said score lines is 0.007 inches.
Claim 4
Dependent Claim
17 words
The device as in claim 1, wherein the residual thickness of said score lines is 0.009 inches.
Claim 5
Dependent Claim
14 words
The device as in claim 1, wherein the container is made of sheet metal.
Claim 6
Dependent Claim
16 words
The device as in claim 1, comprising two arcuate concavities, two bridges and two score lines.
Claim 7
Dependent Claim
17 words
The device as in claim 1, wherein said score lines are disposed facing outwardly from the container.
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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |