Patent US2634221A successfully refreshed from Google Patents.
US2634221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film washing process
Assignee: EIDP Inc
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Filing: 1948-07-13
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Granted: 1953-04-07
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Expires: 1968-07-13
Abstract
No abstract record available.
Inventors
- 👤 Mcalpine Harry
- 👤 Hoerig Herman Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:16
CPC Classifications
B; B29; B29D; B29D7/00; B29C; B29C71/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROCESS FOR WASHING IMPURITIES FROM A TRAVELING WEB OF GEL REGENERATED CELLULOSE CONTAINING WATER SOLUBLE IMPURITIES AND TRAVELING AT THE RATE OF AT LEAST 110 YARDS PER MINUTE IN A SUBSTANTIALLY VERTICAL PATH WHICH COMPRISES COATING THE WEB OF GEL REGENERATED CELLULOSE FILM ON BOTH SIDES WITH A FILM OF FRESH WASH WATER SUFFICIENTLY THIN TO AVOID IMPOSING SUBSTANTIAL TENSION ON SAID GEL FILM DUE TO LIQUID DRAG, MAINTAINING SAID FILM OF FRESH WATER IN CONTACT WITH THE GEL FILM FOR A PERIOD OF TIME SUFFICIENT TO PERMIT DIFFUSION OF IMPURITIES FROM THE GEL FILM TO THE WASH WATER, AND THEREAFTER SCRAPING THE FILM OF CONTAMINATED WASH WATER FROM SAID GEL FILM AND REPEATING THE SEQUENCE OF COATING WITH FRESH WASH WATER AND SCRAPING OF THE FILM OF CONTAMINATED WASH WATER UNTIL THE DESIRED DEGREE OF GEL FILM PURITY IS ATTAINED.
Claim 2
Dependent Claim
142 words
A PROCESS FOR WASHING IMPURITIES FROM A TRAVELING WEB OF GEL REGENERATED CELLULOSE CONTAINING WATER SOLUBLE IMPURITIES AND TRAVELING AT THE RATE OF AT LEAST 110 YARDS PER MINUTE IN A SUBSTANTIALLY VERTICAL PATH WHICH COMPRISES COATING THE WEB OF GEL REGENERATED CELLULOSE FILM ON BOTH SIDES WITH A FILM OF FRESH WASH WATER SUFFICIENTLY THIN TO AVOID IMPOSING SUBSTANTIAL TENSION ON SAID GEL FILM DUE TO LIQUID DRAG, MAINTAINING SAID FILM OF FRESH WATER IN CONTACT WITH THE GEL FILM FOR A PERIOD OF TIME SUFFICIENT TO PERMIT DIFFUSION OF IMPURITIES FROM THE GEL FILM TO THE WASH WATER, AND THEREAFTER SCRAPING THE FILM OF CONTAMINATED WASH WATER FROM SAID GEL FILM AND REPEATING THE SEQUENCE OF COATING WITH FRESH WASH WATER AND SCRAPING OF THE FILM OF CONTAMINATED WASH WATER UNTIL THE DESIRED DEGREE OF GEL FILM PURITY IS ATTAINED.
References Cited (Backward Citations)
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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) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |