US2692210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying and impregnating cellulosic spacers for electrical condensers
Assignee: Sprague Electric Co
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Filing: 1949-12-10
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Granted: 1954-10-19
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Expires: 1969-12-10
Abstract
No abstract record available.
Inventors
- 👤 Burnham John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:33
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/02; B; B29; B29D; B29D7/00; B29C; B29C71/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
A PURIFICATION PROCESS WHICH COMPRISES CONVOLUTELY WINDING AT LEAST TWO INCOMPLETELY WASHED REGENERATED CELLULOSE FILMS WITH AT LEAST TWO ELECTRODE FOILS AND AT LEAST TWO POROUS PAPER SPACER INTO A CYLINDRICAL ROLL HAVING EACH REGENERATED CELLULOSE FILM SEPARATED FROM THE OTHER OF SAID FILMS BY A POROUS PAPER SPACER AND AN ELECTRODE FOIL, FORCING BOILING WATER THROUGH THROUGH SAID ROLL IN AN AXIAL DIRECTION UNTIL THE EFFLUENT LIQUID HAS A CHLORIDE ION CONTENT SUBSTANTIALLY LESS THAN 25 PARTS PER MILLION AND FORCING AN ELECTROLYTIC CAPACITOR ELECTROLYTE IN THE SAME AXIAL DIRECTION THROUGH SAID ROLL UNTIL SAID ROLL IS SATURATED WITH SAID ELECTROLYTE.
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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) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |