Dry cell construction having a one piece plastic closure
Abstract
Abstract A dry cell construction having a one-piece plastic closure covering the open end of the negative electrode can which contains a depolarizer mix and a current collector centrally imbedded in the depolarizer mix. The plastic closure rests on the top edge of the negative electrode can and has a tubular projection extending from the bottom thereof through which the current collector passes. The tubular projection covers the current collector throughout an airspace located above the depolarizer mix. The plastic closure contains at least one venthole extending from its top surface into contact with the airspace above the depolarizer mix and at least one groove in the top surface of the closure extending from the outer edge of the closure into contact with the airspace between the terminal cap on top of the current collector and the plastic closure. It is preferred that the plastic closure have a plurality of ventholes and grooves which are offset from each other. The cell construction of this invention is particularly adapted for rechargeable dry cells which utilize a depolarizer mix containing an azodicarbonamide depolarizer material.
Inventors
- 👤 Mark J Terlecke
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
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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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |