US2729694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery separator
Assignee: Individual
•
Filing: 1953-09-01
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Granted: 1956-01-03
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Expires: 1973-09-01
Abstract
No abstract record available.
Inventors
- 👤 Grenville B Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:59
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/429; H01M50/489; H01M50/491; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
A COMPOSITE IONICALLY PERMEABLE BARRIER TO BE INSERTED BETWEEN THE ELECTRODES OF PRIMARY CELLS COMPRISING A POROUS POLYVINYL CHLORIDE ACTING AS A MECHANICAL SUPPORT, THE PORES OF SAID SUPPORTING MATERIAL CONTAINING A MIXTURE OF ULTRA MICRO-POROUS CELLOPANE AND POLYVINYL ALCOHOL OF HIGH IONIC CONDUCTIVITY AND LOW ELECTRIC RESISTANCE.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |