US2860944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching fibers of vegetable origin with formamidine sulfinate and alkaline peroxide
Assignee: EIDP Inc
•
Filing: 1955-11-28
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Granted: 1958-11-18
•
Expires: 1975-11-28
Abstract
No abstract record available.
Inventors
- 👤 James H Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:08
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/10; D06L4/30; D06L4/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
IN A METHOD OF BLEACHING VEGETABLE FIBERS OF THE GROUP CONSISTING OF COTTON, KRAFT WOOD PULP AND SULFITE WOOD PULP WITH AN ALKALINE PEROXIDE SOLUTION, THE IMPROVEMENT COMPRISING EXTRACTING NATURALLY OCCURING COLOR BODIES FROM SAID FIBERS WITH AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION OF A FORMAMIDINE SULFINATE PRIOR TO BLEACHING SAID FIBERS WITH THE ALKALINE PEROXIDE SOLUTION.
Claim 2
Dependent Claim
57 words
IN A METHOD OF BLEACHING VEGETABLE FIBERS OF THE GROUP CONSISTING OF COTTON, KRAFT WOOD PULP AND SULFITE WOOD PULP WITH AN ALKALINE PEROXIDE SOLUTION, THE IMPROVEMENT COMPRISING EXTRACTING NATURALLY OCCURING COLOR BODIES FROM SAID FIBERS WITH AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION OF A FORMAMIDINE SULFINATE PRIOR TO BLEACHING SAID FIBERS WITH THE ALKALINE PEROXIDE SOLUTION.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |