US3847669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced mercury containing zinc alkaline cells
Assignee: Edgewell Personal Care Brands LLC
•
Filing: 1973-08-03
•
Granted: 1974-11-12
•
Expires: 1993-08-03
Abstract
Abstract The proportion of mercury needed in alkaline zinc-manganese dioxide cells to provide adequate shelf life is reduced by incorporating in such cells an ethylene oxide polymer.
Inventors
- 👤 S Paterniti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:23
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/62; H01M4/628; H01M4/36; H01M4/38; H01M6/00; H01M6/04; H01M6/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A GALVANIC CELL HAVING A ZINC ANODE, A MANGANESE DIOXIDE CATHODE AND AN ALKALINE ELECTROLYTE, SAID ZINC ANODE CONTAINING LESS THAN 8 PERCENT MERCURY BASED ON THE WEIGHT OF THE ZINC ANODE, SAID CELL ALSO CONTAINING AN ETHYLENE OXIDE POLYMER SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE GLYCOL, TRIETHYLENE GLYCOL, POLYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 190 TO ABOUT 7,000, C4 AND LOWER ALKYL ETHERS THEREOF AND C4 AND LOWER ALKANOATE ESTERS THEREOF, SAID ETHYLENE OXIDE POLYMER AND SAID MERCURY IN COMBINATION PROVIDING AN IMPROVED STORAGE STABILITY UNDER COMPARABLE CONDITIONS FOR SAID CELL AS PROVIDED BY A CELL OTHERWISE IDENTICAL BUT CONTAINING THE SAME QUANTITY OF MERCURY IN THE ABSENCE OF SAID ETHYLENE OXIDE POLYMER.
Claim 2
Dependent Claim
119 words
A GALVANIC CELL HAVING A ZINC ANODE, A MANGANESE DIOXIDE CATHODE AND AN ALKALINE ELECTROLYTE, SAID ZINC ANODE CONTAINING LESS THAN 8 PERCENT MERCURY BASED ON THE WEIGHT OF THE ZINC ANODE, SAID CELL ALSO CONTAINING AN ETHYLENE OXIDE POLYMER SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE GLYCOL, TRIETHYLENE GLYCOL, POLYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 190 TO ABOUT 7,000, C4 AND LOWER ALKYL ETHERS THEREOF AND C4 AND LOWER ALKANOATE ESTERS THEREOF, SAID ETHYLENE OXIDE POLYMER AND SAID MERCURY IN COMBINATION PROVIDING AN IMPROVED STORAGE STABILITY UNDER COMPARABLE CONDITIONS FOR SAID CELL AS PROVIDED BY A CELL OTHERWISE IDENTICAL BUT CONTAINING THE SAME QUANTITY OF MERCURY IN THE ABSENCE OF SAID ETHYLENE OXIDE POLYMER.
Claim 3
Dependent Claim
13 words
the cell of claim 1 wherein the alkaline electrolyte is aqueous potassium hydroxide.
Claim 4
Dependent Claim
31 words
The cell of claim 2 wherein the ethylene oxide polymer is present in the cell in an amount greater than about 0.01 weight per cent, based on weight of said zinc.
Claim 5
Dependent Claim
31 words
The cell of claim 2 wherein the ethylene oxide polymer is present in the cell in an amount greater than about 0.1 weight per cent, based on weight of said zinc.
Claim 6
Dependent Claim
31 words
The cell of claim 3 wherein the ethylene oxide polymer is present in an amount of from about 0.01 to about 1 weight per cent based on weight of said zinc.
Claim 7
Dependent Claim
31 words
The cell of claim 4 wherein the ethylene oxide polymer is present in an amount of from about 0.1 to about 1 weight per cent, based on weight of said zinc.
Claim 8
Dependent Claim
29 words
The cell of claim 2 wherein the ethylene oxide polymer is polyethylene glycol or methoxy polyethylene glycol having an average molecular weight of from about 300 to about 700.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |