US2938764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly alkaline dichlorodimethylhydantoin bleaching solutions and methods
Assignee: Wyandotte Chemicals Corp
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Filing: 1957-02-25
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Granted: 1960-05-31
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Rodney A Blomfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:24
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/20; D06L4/27
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
AN IMPROVED METHOD FOR BLEACHING COTTON FABRICS, WHICH COMPRISES, AGITATING SAID FABRICS IN AN ALKALINE AQUEOUS BLEACH COMPOSITION AT A TEMPERATURE IN THE RANGE OF ABOUT 140 TO 210*F., SAID AQUEOUS BLEACH COMPOSITION COMPRISING WATER, AN ALKALIZING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES, ALKALI METAL SILICATES AND MIXTURES THEREOF AND 1,3-DICHLORO5,5-DIMETHYLHYDANTOIN, THE AMOUNT OF SAID ALKALIZING AGENT BEING SUFFICIENT SO THAT THE HYDROGEN ION CONCENTRATION OF SAID AQUEOUS BLEACH COMPOSITION CORRESPONDS TO A PH IN THE RANGE OF 12 TO 14, AND THE AMOUNT OF SAID 1,3-DICHLORO-5,5-DIMETHYLHYDANTOIN BEING FROM 0.0018 TO 0.54 WEIGHT PERCENT BASED ON THE WEIGHT OF 1,3-DICHLORO5,5-DIMETHYLHYDANTOIN AND WATER IN SAID AQUEOUS BLEACH COMPOSITION.
References Cited (Backward Citations)
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Cited
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Cited
US2422255A
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US2430233A
Cited
US2438781A
Cited
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Cited
US2578270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |