US3630783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-shrinkable packaging for batteries
Assignee: Duracell Inc Canada
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Filing: 1970-05-11
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Granted: 1971-12-28
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Expires: 1990-05-11
Abstract
Abstract A heat-shrinkable insulating jacket surrounds the cell can, and is thus anchored and holds a cell-closure disc tightly to close the cell. A filament between can and jacket holds them slightly spaced along the filament enough to define two adjacent and parallel narrow limited air passages to serve as a vent passage alongside the filament.
Inventors
- 👤 Franciszek Przybyla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:54
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/08; H01M50/00; H01M50/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A primary electric dry cell, as in claim 1, in which said insulating plastic tube is heat shrunk onto said can for anchorage thereto, and is seal bonded to said annular edge border of said cap and holding said cap in tightly closing position on said can; and said venting means is disposed along the inner surface of said plastic tube and extends to outside one end of said plastic tube defining a colinear free space providing free-exit passage to any gas bubbles generated in said closed cell during operation by current between said electrodes or during storage.
Claim 2
Dependent Claim
84 words
A primary dry cell as in claim 2, in which said plastic housing snugly engages said cylindrical can terminal except along a linear region along which the housing is spaced from said can electrode defining an exit passage communicating at its upper or inner end with the space within the cylinDrical can and extending to its lower end to an open port communicating with outer space, outside of the cell providing and serving as a vent passage for gas bubbles formed in the cell.
Claim 3
Dependent Claim
57 words
A primary dry cell as in claim 3, in which said venting means comprises a filamentary element disposed and held between the cylindrical plastic housing and the cylindrical can terminal, and said filamentary element serves as a spacer defining a limited linear region as an exit passage along which said plastic housing is spaced from said can.
Claim 4
Dependent Claim
81 words
A primary dry cell, as in claim 3 in which said can terminal is closed at the bottom and open at the top; and said top insulating disc closes the top opening of said can except for a small opening serving as a vent port for any bubbles formed in the space within said can, said vent port being disposed in spatial communication with said linear free exit passage permitting bubbles to pass freely out of said cell as a whole.
Claim 5
Dependent Claim
50 words
A primary dry cell, as in claim 5, in which said top insulating disc is supported on the upper end of said can electrode, and in turn supports a terminal plate on its outer exposed surface; and said terminal plate is electrically connected to said anode electrode within the cell.
Claim 6
Dependent Claim
92 words
A primary dry cell, as in claim 6, in which said plastic housing is of heat-shrinkable tubing fitting snugly around the can electrode along the length of said can electrode, and to fit around the circular border of said top insulating disc in peened-over flange relation, and fitting around the bottom end of said can in peened-over relation, with a small vent opening left at the bottom of said plastic housing providing an exit port for free exit of bubbles traversing said free passage along the inner surface of said snug housing.
Claim 7
Dependent Claim
41 words
A primary dry cell, as in claim 7 in which said peened-over upper flange of said snug plastic housing is sealed around the rim border of said insulating disc at the top of the can providing a top hermetic seal closure.
Claim 8
Dependent Claim
76 words
A primary dry cell, as in claim 7, in which said vent means of claim 1 disposed along the inner surface of said snug housing defining a free space serving as a discharge passage for bubbles from said cell, consists of an elongated filamentary element squeezed between the can and the snug heat-shrinkable enclosure, and defining limited free-gas passages alongside said filamentary element, communicating with the inside of the cell and the space outside the cell.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |