US2513787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching treatment for cellulosic materials
Assignee: Brown Co
•
Filing: 1947-01-31
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Granted: 1950-07-04
•
Expires: 1967-01-31
Abstract
No abstract record available.
Inventors
- 👤 George A Day
- 👤 Benjamin G Hoos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:30
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/12; D21C9/14; D21C9/144
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
METHOD OF BLEACHING A CELLULOSIC MATERIAL COMPRISING SUBJECTING THE MATERIAL TO THE ACTION OF AN AQUEOUS SOLUTION OF HYPOCHLORITE AND CHLORITE MAINTAINED FIRST AT A PH ABOVE 9, CONSUMPTION OF ANY SUBSTANTIAL AMOUNT OF CHLORITE BEING THEREBY AVOIDED, AND THEN AT A PH BELOW 5, THE SOLUTION BEING BROUGHT TO THE LOWER PH UPON SUBSTANTIAL EXHAUSTION OF THE HYPOCHLORITE, THE CHLORITE BEING THE EFFECTIVE BLEACHING REAGENT THEREAFTER.
Claim 2
Dependent Claim
67 words
METHOD OF BLEACHING A CELLULOSIC MATERIAL COMPRISING SUBJECTING THE MATERIAL TO THE ACTION OF AN AQUEOUS SOLUTION OF HYPOCHLORITE AND CHLORITE MAINTAINED FIRST AT A PH ABOVE 9, CONSUMPTION OF ANY SUBSTANTIAL AMOUNT OF CHLORITE BEING THEREBY AVOIDED, AND THEN AT A PH BELOW 5, THE SOLUTION BEING BROUGHT TO THE LOWER PH UPON SUBSTANTIAL EXHAUSTION OF THE HYPOCHLORITE, THE CHLORITE BEING THE EFFECTIVE BLEACHING REAGENT THEREAFTER.
References Cited (Backward Citations)
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Cited
US2194956A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |