US2852453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of cellulose precipitation bath concentrations
Assignee: Individual
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Filing: 1955-10-21
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Granted: 1958-09-16
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Expires: 1975-10-21
Abstract
No abstract record available.
Inventors
- 👤 Hausner Johann Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:03
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
128 words
A PROCESS OF TREATING A PRECIPITATION BATH FOR CELLULOSE PRODUCTS CONTAINING SULFURIC ACID AND SODIUM SULFATE, WHICH COMPRISES PASSING AN ELECTRIC CURRENT THROUGH THE BATH BETWEEN A CATHODE AND AN ANODE TO CREATE A D. C. FIELD THEREIN, INTERPOSING AN ELECTROLYSIS DIAPHRAGM BETWEEN THE CATHODE AND THE ANODE, CARRYING OUT PRECIPITATION ON THE ANODE SIDE OF THE DIAPHRAGM WITH CONSEQUENT ADDITION OF SODIUM BASE TO THE BATH, REMOVING SODIUM BASE FROM THE BATH ON THE CATHODE SIDE OF THE DIAPHRAGM AND SUPERIMPOSING ON THE D. C. FIELD AT LEAST TWO HIGH FREQUENCY FIELDS WHOSE FREQUENCIES, EXPRESSED IN WAVE LENGTHS IN AIR, ARE OF A MAGNITUDE OF 1.8 TO 16 METERS AND WHICH DIFFER FROM ONE ANOTHER BY A MAGNITUDE OF 2 TO 75% OF THEIR AVERAGE WAVE LENGTH.
References Cited (Backward Citations)
BE516237A
Cited
US1162213A
Cited
GB215851A
Cited
US1980873A
Cited
FR843625A
Cited
US2341356A
Cited
GB629099A
Cited
DE905360C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |