Patent US3372879A successfully refreshed from Google Patents.
US3372879A
Expired / Lapsed
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Process for making a mechanical pulp from wood chips
Assignee: Consolidated Paper Bahamas Ltd
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Filing: 1966-08-18
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Granted: 1968-03-12
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Expires: 1986-08-18
Abstract
No abstract record available.
Inventors
- 👤 Howard W H Jones
- 👤 Donald E Helleur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:58
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE TREATMENT OF WOOD CHIPS COMPRISING THE STEPS OF : DISC REFINING WOOD CHIPS, SEPARATING THE DISC REFINED WOOD MATERIAL INTO A PRIMARY ACCEPTABLE PULP AND A NON-ACCEPTABLE WOOD MATERIAL, SEPARATING THE NON-ACCEPTABLE WOOD MATERIAL INTO A COARSE FRACTION AND A LESS COARSE FRACTION, DISC REFINING THE COARSE AND LESS COARSE FRACTIONS SEPARATELY, COMBINING THE DISC REFINED COARSE AND LESS COARSE FRACTIONS, SEPARATING THE COMBINED FRACTIONS OF WOOD MATERIAL INTO A SECONDARY ACCEPTABLE PULP AND A PRIMARY REJECT MATERIAL, AND BLENDING SAID PRIMARY AND SECONDARY ACCEPTABLE PULPS.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE TREATMENT OF WOOD CHIPS COMPRISING THE STEPS OF : DISC REFINING WOOD CHIPS, SEPARATING THE DISC REFINED WOOD MATERIAL INTO A PRIMARY ACCEPTABLE PULP AND A NON-ACCEPTABLE WOOD MATERIAL, SEPARATING THE NON-ACCEPTABLE WOOD MATERIAL INTO A COARSE FRACTION AND A LESS COARSE FRACTION, DISC REFINING THE COARSE AND LESS COARSE FRACTIONS SEPARATELY, COMBINING THE DISC REFINED COARSE AND LESS COARSE FRACTIONS, SEPARATING THE COMBINED FRACTIONS OF WOOD MATERIAL INTO A SECONDARY ACCEPTABLE PULP AND A PRIMARY REJECT MATERIAL, AND BLENDING SAID PRIMARY AND SECONDARY ACCEPTABLE PULPS.
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) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |