US2740689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peroxide bleaching with polyphosphates and alkali salt of edtaa
Assignee: FMC Corp
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Filing: 1952-04-26
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Granted: 1956-04-03
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Expires: 1972-04-26
Abstract
No abstract record available.
Inventors
- 👤 Bernard K Easton
- 👤 Jr William H Kibbel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:35
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/10; D06L4/18; D06L4/12; Y; Y10; Y10S; Y10S424/00; Y10S424/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN THE METHOD OF BLEACHING CELLULOSIC FIBERS, WHICH COMPRISES IMPREGNATING THE FIBERS WITH FROM 60% TO 125% OF AN ALKALINE PEROXIDE BLEACHING SOLUTION AND THEN EXPOSING THE IMPREGNATED FIBERS TO A STEAM ATMOSPHERE, THE IMPROVEMENT WHICH COMPRISES IMPREGNATING THE FIBERS IN THE ABSENCE OF SOLUBLE SILICATE WITH AN ALKALINE PEROXIDE BLEACHING SOLUTION CONTAINING AS ESSENTIAL INGREDIENTS A POLYPHOSPHATE AND AN ALKALI SALT OF ETHYLENE DIAMINE TETREACETIC ACID.
Claim 2
Dependent Claim
67 words
IN THE METHOD OF BLEACHING CELLULOSIC FIBERS, WHICH COMPRISES IMPREGNATING THE FIBERS WITH FROM 60% TO 125% OF AN ALKALINE PEROXIDE BLEACHING SOLUTION AND THEN EXPOSING THE IMPREGNATED FIBERS TO A STEAM ATMOSPHERE, THE IMPROVEMENT WHICH COMPRISES IMPREGNATING THE FIBERS IN THE ABSENCE OF SOLUBLE SILICATE WITH AN ALKALINE PEROXIDE BLEACHING SOLUTION CONTAINING AS ESSENTIAL INGREDIENTS A POLYPHOSPHATE AND AN ALKALI SALT OF ETHYLENE DIAMINE TETREACETIC ACID.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |