US3058871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulp recovery process
Assignee: Riverside Paper Corp
•
Filing: 1959-10-28
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Granted: 1962-10-16
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Expires: 1979-10-28
Abstract
No abstract record available.
Inventors
- 👤 Eugene F Davis
- 👤 Robert H Lace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:19
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A PROCESS FOR THE RECOVERY OF HIGH QUALITY PULPULP FROM WASTE PAPER CONTAINING A COATING AGENT, WHICH PROCESS COMPRISES TREATING THE PAPER IN A NON-AQUEOUS EN-VIROMENT BY THE STEPS OF SEQUENTIALLY BATCH CONTACTING WASTE PAPER CONTAINING A COATING AGENT SELECTED FROM THE GROUP CONSISTING OF WAXES, PLASTICS, AND MIXTURES THEREOF, IN A TREATING ZONE WITH A PLURALITY OF TREATING THE MATERIAL WHICH CONSISTS ESSENTIALLY OF BATCHES OF ORGANIC SOLVENT FOR SAID COATING AGENT WITH THE SOLVENT OF EACH BATCH IN A CONCENTRATION OF AT LEAST ABOUT THREE PARTS PER PART OF PAPER, AND AT TREATING TEMPERATURE BELOW THE BOILING POINT OF THE SOLVENT AND UNDER CONDITIONS OF VIOLENT AGITATION SUFFICIENT TO MAINTAIN SAID SOLVENT IN TURBULENT MOTION AND TO MAINTAIN DISSOLVED COATING MATERIALS SUBSTANTIALLY UNIFORMLY DISTRIBUTED THROUGHOUT SAID SOLVENT, FOR A TIME SUFFICIENT TO DISSOLVE AND REMOVE SAID COATING AGENT FROM SAID PAPER, SEPARATING SAID SOLVENT FROM SAID PAPER AND DISTILLING RESIDUAL SOLVENT FROM SAID PAPER WHEREBY PURIFIED PAPER PULP SUBSTANTIALLY FREE OF
Claim 2
Dependent Claim
163 words
A PROCESS FOR THE RECOVERY OF HIGH QUALITY PULPULP FROM WASTE PAPER CONTAINING A COATING AGENT, WHICH PROCESS COMPRISES TREATING THE PAPER IN A NON-AQUEOUS EN-VIROMENT BY THE STEPS OF SEQUENTIALLY BATCH CONTACTING WASTE PAPER CONTAINING A COATING AGENT SELECTED FROM THE GROUP CONSISTING OF WAXES, PLASTICS, AND MIXTURES THEREOF, IN A TREATING ZONE WITH A PLURALITY OF TREATING THE MATERIAL WHICH CONSISTS ESSENTIALLY OF BATCHES OF ORGANIC SOLVENT FOR SAID COATING AGENT WITH THE SOLVENT OF EACH BATCH IN A CONCENTRATION OF AT LEAST ABOUT THREE PARTS PER PART OF PAPER, AND AT TREATING TEMPERATURE BELOW THE BOILING POINT OF THE SOLVENT AND UNDER CONDITIONS OF VIOLENT AGITATION SUFFICIENT TO MAINTAIN SAID SOLVENT IN TURBULENT MOTION AND TO MAINTAIN DISSOLVED COATING MATERIALS SUBSTANTIALLY UNIFORMLY DISTRIBUTED THROUGHOUT SAID SOLVENT, FOR A TIME SUFFICIENT TO DISSOLVE AND REMOVE SAID COATING AGENT FROM SAID PAPER, SEPARATING SAID SOLVENT FROM SAID PAPER AND DISTILLING RESIDUAL SOLVENT FROM SAID PAPER WHEREBY PURIFIED PAPER PULP SUBSTANTIALLY FREE OF
References Cited (Backward Citations)
US1990376A
Cited
US2703754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |