Patent US3787243A successfully refreshed from Google Patents.
US3787243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy cell
Assignee: Duracell Inc USA
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Filing: 1972-05-08
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Granted: 1974-01-22
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Expires: 1992-05-08
Abstract
Abstract An electric cell having a hermetic pressure seal, and subject to development of high internal gas pressure in the normal operating region, and provided with an auxiliary venting region at atmospheric pressure separated from the operating region with a frangible disc in a separating wall between operating and venting regions with cotton flock in the venting region to retard any high pressure gas and electrolyte injected after fracture of the disc by high pressure in operating region.
Inventors
- 👤 J Zaleski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:38
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/30; H01M50/342; H01M50/3425; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
35 words
An electric cell, as in claim 1, in which a material is disposed in said auxiliary space to retard and slow-down any gas volume driven into said auxiliary space under pressure from said defined space.
Claim 2
Dependent Claim
32 words
An electric cell, as in claim 1, in which a barrier material is disposed in said auxiliary space to immobilize any electrolyte forced into said auxiliary space when said safety divider ruptures.
Claim 3
Dependent Claim
25 words
A electric cell, as in claim 1, in which said auxiliary space-defining means is an elongated cylindrical cup disposed co-axially and concentrically within the cell.
Claim 4
Dependent Claim
23 words
An electric cell, as in claim 4, in which said auxiliary space-defining means also embodies said means that constitute the safety rupturable divider.
Claim 5
Dependent Claim
59 words
An electric cell, as in claim 1, in which said container can is relatively cup-shaped with its top end initially open; a metallic cap is disposed at and physically joined to the open end of said container can and electrically insulated therefrom, to close and seal said can; and means supporting said auxiliary space-defining means from said metallic cap.
Claim 6
Dependent Claim
24 words
An electric cell, as in claim 6, in which said means for supporting said auxiliary space-defining means consists of an elongated linear metallic element.
Claim 7
Dependent Claim
39 words
An electric cell, as in claim 7, in which said linear metallic element is axially disposed within said cell; and an anode contact element is disposed to engage and support the anode material in operative position in said cell.
Claim 8
Dependent Claim
94 words
An electric cell, as in claim 1, in which said anode terminal assembly consists of a metal disc to serve as an end terminal for the cell, a nail welded coaxially to said disc and having an axially depending shank with a head on its bottom end, a hollow cylindrical metallic cup resting Coaxially on said nail head and electrically connected thereto, a hollow cylindrical insulating cup resting within said metallic cup, and a snap ring for engaging the nail shank to lock the insulating cup and the metallic cup against the nail head.
Claim 9
Dependent Claim
36 words
An electric cell, as in claim 9, in which said insulating cup has a small section of its wall thinned to be rupturable when the gas pressure within the cell reaches or exceeds a predetermined value.
Claim 10
Dependent Claim
46 words
An electric cell, as in claim 9, in which the anode material of the cell surrounds said anode terminal assembly and engages said cylindrical metallic cup which serves as a current collector to said nail for conduction to said metallic disc as a cell electrode terminal.
Claim 11
Dependent Claim
16 words
An electric cell, as in claim 2, in which said retarding material is a cellulose material.
Claim 12
Dependent Claim
16 words
An electric cell, as in claim 3, in which said barrier material is a cellulose material.
Claim 13
Dependent Claim
87 words
An electric cell, as in claim 13, in which said auxiliary space is arranged and disposed to have a passage of maximum dimension in a specific direction, and said passage at its forward end communicates with space outside the cell through a small vent hole; and said rupturable divider is positioned at the back or upstream end of said path so the retarding material is effective along its whole length in the auxiliary space to slow down and depress the pressured gas forced into said auxiliary space.
Claim 14
Dependent Claim
51 words
An electric cell, as in claim 1, in which means are provided to cooperate with said rupturable divider to establish a pressure gradient in a predetermined path through said cell, with means disposed along said path to control gas pressure and electrolyte movement injected into said path through said rupturable divider.
Claim 15
Dependent Claim
14 words
An electric cell, as in claim 12, in which said retarding material is cotton.
Claim 16
Dependent Claim
14 words
An electric cell, as in claim 13, in which said barrier material is cotton.
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |