Patent US3085927A successfully refreshed from Google Patents.
US3085927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of fibers having differing characteristics
Assignee: International Paper Co
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Filing: 1960-11-16
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Granted: 1963-04-16
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Expires: 1980-11-16
Abstract
No abstract record available.
Inventors
- 👤 Anthony W Pesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:43
CPC Classifications
D; D21; D21H; D21H15/00; D21H15/02; D21B; D21B1/00; D21B1/04; D21B1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE PROCESS WHICH COMPRISES DE-FIBERIZING WOOD INTO CELLULOSE PULP AS AN AQUEOUS SLURRY CONTAINING A HETEROGENEOUS MIXTURE OF SPRINGWOOD AND SUMMERWOOD FIBERS, SEPARATING THE MIXTURE INTO FIBER FRACTIONS RESPECTIVELY CONTAINING PREDOMINANTLY SPRINGWOOD AND SUMMERWOOD FIBERS BY SUBJECTING THE SLURRY TO FORCES WHICH CAUSE THE FIBERS HAVING A COM GRAVITY TO SEPARATE FROM THE FIBERS WHICH HAVE A COMPRATIVELY HIGHER APPARENT SPECITFIC GRAVITY, THEN MAKING A PAPER-LIKE SHEET FROM AT LEAST ONE OF THE FIBER FRACTIONS.
Claim 2
Dependent Claim
75 words
THE PROCESS WHICH COMPRISES DE-FIBERIZING WOOD INTO CELLULOSE PULP AS AN AQUEOUS SLURRY CONTAINING A HETEROGENEOUS MIXTURE OF SPRINGWOOD AND SUMMERWOOD FIBERS, SEPARATING THE MIXTURE INTO FIBER FRACTIONS RESPECTIVELY CONTAINING PREDOMINANTLY SPRINGWOOD AND SUMMERWOOD FIBERS BY SUBJECTING THE SLURRY TO FORCES WHICH CAUSE THE FIBERS HAVING A COM GRAVITY TO SEPARATE FROM THE FIBERS WHICH HAVE A COMPRATIVELY HIGHER APPARENT SPECITFIC GRAVITY, THEN MAKING A PAPER-LIKE SHEET FROM AT LEAST ONE OF THE FIBER FRACTIONS.
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) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |