US2694059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition in chlorite bleaching of cellulose derivatives
Assignee: Hercules Powder Co
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Filing: 1951-05-17
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Granted: 1954-11-09
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Expires: 1971-05-17
Abstract
No abstract record available.
Inventors
- 👤 Bayard T Lamborn
- 👤 Richard A Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:52
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/04; C08; C08B; C08B11/00; C08B11/20; C08B3/00; C08B3/22; C08B3/30; D; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/23; D06L4/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
THE METHOD OF IMPROVING THE THERMAL COLOR STABILITY OF A CELLULOSE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF CELLULOSE ESTER AND CELLULOSE ETHERS AND OF INHIBITING THE CORROSIVE ACTION OF THE BLEACHING AGENT EMPOLYED IN THE PROCESS WHICH COMPRISES TREATING SAID CELLULOSE DERIVATIVE WITH FROM 0.001 TO 0.015 PART OF A METAL CHLORITE BLEACHING AGENT PER PART OF CELLULOSE DERIVATIVE, SAID METAL CHLORITE BLEACHING AGENT BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL CHLORITES IN CONTACT WITH STAINLESS STEEL CORRODIBLE BY SAID BLEACHING AGENT IN AN AQUEOUS SLURRY CONTAINING ESSENTIALLY WATER, SAID CELLULOSE DERIVATIVE, SAID BLEACHING AGENT AND A PHOSPHORIC ACID, THE PH OF SAID SLURRY BEING FROM 3 TO 6, AND SAND BLEACHING AGENT AND SAID PHOSPHORIC ACID BEING PRESENT IN AMOUNTS SUFFICIENT TO IMPROVE THE COLOR OF SAID CELLULOSE DERIVATIVE AND TO INHIBIT THE CORROSION OF SAID STAINLESS STEEL.
Claim 2
Independent Claim
146 words
THE METHOD OF IMPROVING THE THERMAL COLOR STABILITY OF A CELLULOSE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF CELLULOSE ESTER AND CELLULOSE ETHERS AND OF INHIBITING THE CORROSIVE ACTION OF THE BLEACHING AGENT EMPOLYED IN THE PROCESS WHICH COMPRISES TREATING SAID CELLULOSE DERIVATIVE WITH FROM 0.001 TO 0.015 PART OF A METAL CHLORITE BLEACHING AGENT PER PART OF CELLULOSE DERIVATIVE, SAID METAL CHLORITE BLEACHING AGENT BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL CHLORITES IN CONTACT WITH STAINLESS STEEL CORRODIBLE BY SAID BLEACHING AGENT IN AN AQUEOUS SLURRY CONTAINING ESSENTIALLY WATER, SAID CELLULOSE DERIVATIVE, SAID BLEACHING AGENT AND A PHOSPHORIC ACID, THE PH OF SAID SLURRY BEING FROM 3 TO 6, AND SAND BLEACHING AGENT AND SAID PHOSPHORIC ACID BEING PRESENT IN AMOUNTS SUFFICIENT TO IMPROVE THE COLOR OF SAID CELLULOSE DERIVATIVE AND TO INHIBIT THE CORROSION OF SAID STAINLESS STEEL.
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) | 1957-11-08 | 1958-05-10 | 1958-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-08 | 1962-05-10 | 1962-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-08 | 1966-05-10 | 1966-11-09 | $7700.00 | Window Closed / Lapsed |