Patent US3057794A successfully refreshed from Google Patents.
US3057794A
Expired / Lapsed
US
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Electrolytic cell diaphragm
Assignee: PPG Industries Inc
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Filing: 1961-10-10
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Granted: 1962-10-09
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Expires: 1981-10-10
Abstract
No abstract record available.
Inventors
- 👤 William W Carlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:24
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B13/00; C25B13/04; C25B13/05; C25B13/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
IN AN ELECTROLYTIC CELL FOR PRODUCTION OF ALKALI METAL HYDROXIDE, HAVING AN ANODE AND A CATHODE AND A DIAPHRAGM THEREBETWEEN, THE IMPROVEMENT WHEREIN THE DIAPHRAGM IS ASBESTOS SUBSTANTIALLY COMPLETELY IMPREGNATED WITH A HALOGENATED DRYING OIL SAID IMPREGNATED DIAPHRAGHM BEING ESSENTIALLY IMPERVIOUS TO THE FLOW OF BRINE.
Claim 2
Dependent Claim
46 words
IN AN ELECTROLYTIC CELL FOR PRODUCTION OF ALKALI METAL HYDROXIDE, HAVING AN ANODE AND A CATHODE AND A DIAPHRAGM THEREBETWEEN, THE IMPROVEMENT WHEREIN THE DIAPHRAGM IS ASBESTOS SUBSTANTIALLY COMPLETELY IMPREGNATED WITH A HALOGENATED DRYING OIL SAID IMPREGNATED DIAPHRAGHM BEING ESSENTIALLY IMPERVIOUS TO THE FLOW OF BRINE.
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) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |