Patent US2822236A successfully refreshed from Google Patents.
US2822236A
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US
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Process of maintaining brightness in high density wood pulp having a ph6-10 by adding hydrogen peroxide and composition produced thereby
Assignee: FMC Corp
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Filing: 1954-11-19
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Granted: 1958-02-04
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Expires: 1974-11-19
Abstract
No abstract record available.
Inventors
- 👤 Fred R Sheldon
- 👤 Robert L Mcewen
- 👤 Carl E Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:38
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026; D21C9/1047
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
A NEW COMPOSITION OF MATTER, A BLEACHED WOOD PULP FROM THE GROUP CONSISTING OF BLEACHED CHEMICAL AND BLEACHED SEMI-CHEMICAL WOOD PULPS, SAID PULP HAVING BEEN BLEACHED WITH AN AMOUNT OF A BLEACH FROM THE GROUP CONSISTING OF CHLORINE BLEACHES, PEROXIDE BLEACHES AND COMBINATIONS OF CHLORINE AND PEROXIDE BLEACHES TO PROVIDE IN SAID PULP A GE BRIGHTNESS OF 50-85, SAID PULP HAVING A DENSITY OF 75% TO 95%, A PH IN THE RANGE PH 6 TO PH 10 AND HAVING 0.02% TO 0.25% HYDROGEN PEROXIDE ON A DRY PULP BASIS WHEREBY THE BRIGHTNESS OF SAID PULP IS MAINTAINED DURING STORAGE.
References Cited (Backward Citations)
US2514503A
Cited
US2661261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |