Patent US2856402A successfully refreshed from Google Patents.
US2856402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of cotton linters
Assignee: Hercules Powder Co
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Filing: 1955-09-26
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Granted: 1958-10-14
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Expires: 1975-09-26
Abstract
No abstract record available.
Inventors
- 👤 Harry W Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:16
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B1/00; C08B11/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
IN THE METHOD FOR PURIFYING RAW COTTON LINTERS WHEREIN SAID RAW COTTON LINTERS ARE DIGESTED WITH AQUEOUS CAUSTIC AT AN ELEVATED TEMPERATURE AND PRESSURE, THE IMPROVEMENT WHICH COMPRISES CHEMICALLY MODIFYING SAID RAW COTTON LINTERS BY ADDING HYDROPHILIC ETHER SUBSTITUENT TO THE ANHYDROGLUCOSE UNITS AT LEAST PRIOR TO THE SECOND HALF OF SAID DIGESTION AND THEREBY PREVENTING ANY SUBSTANTIAL INCREASE IN THE CRYSTALLINITY OF SAID RAW COTTON LINTERS, THE RESULTING CHEMICALLY MODIFIED COTTON LINTERS BEING ALKALI-INSOLUBLE AND WATER-INSOLUBLE AND RETAINING THE FIBROUS STRUCTURE OF THE UNMODIFIED RAW COTTON LINTERS
Claim 2
Dependent Claim
88 words
IN THE METHOD FOR PURIFYING RAW COTTON LINTERS WHEREIN SAID RAW COTTON LINTERS ARE DIGESTED WITH AQUEOUS CAUSTIC AT AN ELEVATED TEMPERATURE AND PRESSURE, THE IMPROVEMENT WHICH COMPRISES CHEMICALLY MODIFYING SAID RAW COTTON LINTERS BY ADDING HYDROPHILIC ETHER SUBSTITUENT TO THE ANHYDROGLUCOSE UNITS AT LEAST PRIOR TO THE SECOND HALF OF SAID DIGESTION AND THEREBY PREVENTING ANY SUBSTANTIAL INCREASE IN THE CRYSTALLINITY OF SAID RAW COTTON LINTERS, THE RESULTING CHEMICALLY MODIFIED COTTON LINTERS BEING ALKALI-INSOLUBLE AND WATER-INSOLUBLE AND RETAINING THE FIBROUS STRUCTURE OF THE UNMODIFIED RAW COTTON LINTERS
Claim 3
Dependent Claim
75 words
AS A NEW COMPOSITION OF MATTER, A PURIFIED, CHEMICALLY MODIFIED ALKALI-INSOLUBLE AND WATER-INSOLUBLE FIBROUS COTTON LINTERS OF SUBSTANTIALLY INCREASED REACTIVITY, PERMANENTLY AND SUBSTANTIALLY REDUCED CRYSTALLINITY AND FURTHER CHARACTERIZED BY IMPARTING MARKEDLY INCREASED STRENGTH PROPERTIES TO PAPER PRODUCED THEREFROM, SAID LINTERS HAVING BEEN DIGESTED WITH AQUEOUS CAUSTIC AT AN ELEVATED TEMPERATURE AND PRESSURE AND CHEMICALLY MODIFIED BY ADDITION OF HYDROPHILIC ETHER SUBSTITUENT TO THE ANHYDROGLUCOSE UNITS AT LEAST PRIOR TO THE SECONS HALF OF SAID DIGESTION.
Claim 4
Dependent Claim
75 words
AS A NEW COMPOSITION OF MATTER, A PURIFIED, CHEMICALLY MODIFIED ALKALI-INSOLUBLE AND WATER-INSOLUBLE FIBROUS COTTON LINTERS OF SUBSTANTIALLY INCREASED REACTIVITY, PERMANENTLY AND SUBSTANTIALLY REDUCED CRYSTALLINITY AND FURTHER CHARACTERIZED BY IMPARTING MARKEDLY INCREASED STRENGTH PROPERTIES TO PAPER PRODUCED THEREFROM, SAID LINTERS HAVING BEEN DIGESTED WITH AQUEOUS CAUSTIC AT AN ELEVATED TEMPERATURE AND PRESSURE AND CHEMICALLY MODIFIED BY ADDITION OF HYDROPHILIC ETHER SUBSTITUENT TO THE ANHYDROGLUCOSE UNITS AT LEAST PRIOR TO THE SECONS HALF OF SAID DIGESTION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |