US3684580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery separator materials
Assignee: WR Grace and Co
•
Filing: 1970-08-19
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Granted: 1972-08-15
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Expires: 1990-08-19
Abstract
Abstract A BIBULOUS POLYMERIC MATERIAL SUITABLE FOR USE IN MAKING SEPARATORS FOR SILVER-ZINC BATTERIES, THE MATERIAL BEING CHARACTERIZED BY A VERY LOW AVERAGE PORE DIAMETER, ADVANTAGEOUSLY BELOW 300 ANGSTROMS, AND BY A HIGH VOLUME POROSITY, ADVANTAGEOUSLY ABOVE 50%. THIS MATERIAL IS PRIMARILY A COPOLYMER OF METHACRYLIC ACID AND A HYDROPHOBIC MONOMER E.G. STYRENE OR OF METHACRYLIC ACID AND A CROSS-LINKING MONOMER, MOST ADVANTAGEOUSLY DIVINYL BENZENE: AN ESPECIALLY ADVANTAGEOUS PROCESS FOR MAKING SUCH MATERIALS IS ALSO DISCLOSED AND CLAIMED.
Inventors
- 👤 Michael J Lysaght
- 👤 Robert W Hausslein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:53
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/42; H01M50/489; H01M50/491; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |