US3634142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesium dry battery with anode contact protection
Assignee: Clevite Corp
•
Filing: 1970-02-24
•
Granted: 1972-01-11
•
Expires: 1990-02-24
Abstract
Abstract The external, nonreacting surface of the magnesium anode of a dry cell is covered by a protective coating to prevent impairment or loss of electrical contact with the adjacent cell of a battery which, it has been discovered, frequently results from limited but effective chemical action that takes place at this exposed surface and proceeds under presumably sealing barriers to undermine electrical contact with the adjoining cell.
Inventors
- 👤 Lloyd W Eaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:00
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/12; H01M50/00; H01M50/10; H01M50/147; H01M50/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
41 words
Structure in accordance with claim 1 wherein said anode contact area and a hole in said wrapper are located centralLy of said anode and the entire exterior surface of said anode except said contact area is covered by the water-impervious coating.
Claim 2
Dependent Claim
34 words
Structure in accordance with claim 1 and including an intercell connector comprising a body of electrically conductive thermoplastic material adherently engaging and covering said contact area and projecting through said hole in said wrapper.
Claim 3
Dependent Claim
120 words
In a dry cell comprised of flat cell elements including a magnesium anode and enclosed within a film wrapper having a hole therein exposing a limited contact area at the center of the external surface of the anode and seal means for closing the cell at the hole in the wrapper, the improvement wherein the seal means comprises a coating on the anode covering all of the exterior surface of the anode except the contact area thereof, said coating comprising an epoxy primer paint which is water impervious and excludes water molecules from said exterior surface of said anode, and a body of sealing material surrounding the hole in the wrapper between and adhering to said coating and the wrapper.
References Cited (Backward Citations)
US3185592A
Cited
US2229431A
Cited
US2645676A
Cited
US2745894A
Cited
US2880259A
Cited
US3255048A
Cited
US3390016A
Cited
US3525647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |