US3318657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bleaching cellulose fibres
Assignee: Metal Hydrides Inc
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Filing: 1963-09-23
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Granted: 1967-05-09
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Expires: 1983-09-23
Abstract
No abstract record available.
Inventors
- 👤 Robert C Wade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:45
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/30; D06L4/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
THE METHOD FOR BLEACHING CELLULOSE FIBRES WHICH COMPRISES SUBJECTING THE FIBRES TO TREATMENT WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL BOROHYDRIDE HAVING A PH OF AT LEAST 9, AND THEREAFTER TREATING THE FIBRES WITH OZONE IN AN AQUEOUS MEDIUM HAVING A PH BETWEEN ABOUT 2 TO 7.
Claim 2
Independent Claim
48 words
THE METHOD FOR BLEACHING CELLULOSE FIBRES WHICH COMPRISES SUBJECTING THE FIBRES TO TREATMENT WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL BOROHYDRIDE HAVING A PH OF AT LEAST 9, AND THEREAFTER TREATING THE FIBRES WITH OZONE IN AN AQUEOUS MEDIUM HAVING A PH BETWEEN ABOUT 2 TO 7.
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) | 1970-05-08 | 1970-11-07 | 1971-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-08 | 1974-11-07 | 1975-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-08 | 1978-11-07 | 1979-05-09 | $7700.00 | Window Closed / Lapsed |