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US3057769A
Expired / Lapsed
US
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Method of preparing paper of uniform appearance
Assignee: Waldorf Paper Products Co
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Filing: 1955-05-16
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Granted: 1962-10-09
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Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 Nels H Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:54
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
128 words
THE PROCESS OF MAKING A PAPER OF UNIFORM APPEARANCE FREE FROM NORMALLY VISIBLE SPOTS FROM WASTE PAPER STOCK CARRYING BITUMINOUS MATERIAL WHICH COMPRISES THE STEPS OF DISTINTEGRATING THE STOCK IN THE PAPER BEATER TO FORM A RELATIVELY THICK PULP CARRYING ALL THE MATERIALS OF THE STOCK, THINNING THE PULP WITH WATER TO ABOUT SEVENTENTHS OF ONE PERCENT TO ONE PERCENT OF FIBER SO THAT ADVENTITIOUS MATERIAL MAY BE SEPARATE OUT, THICKENING THE FIBROUS PULP, EXPRESSING WATER FROM THE FIBROUS PULP TO REACH A PERCENTAGE TO ABOUT SIXTY TO SEVENTY PERCENT OF WATER AND THIRTY TO FORTY PERCENT OF PULP, PUTTING THE THICKENED PULP THROUGH A DEFIBRATION ACTION AT AN ELEVATED TEMPERATURE ABOVE THE BOILING POINT OF WATER AND IN THE PRESENCE OF STEAM UNDER PRESSURAE OF ABOUT FORTY-FIVE
Claim 2
Dependent Claim
128 words
THE PROCESS OF MAKING A PAPER OF UNIFORM APPEARANCE FREE FROM NORMALLY VISIBLE SPOTS FROM WASTE PAPER STOCK CARRYING BITUMINOUS MATERIAL WHICH COMPRISES THE STEPS OF DISTINTEGRATING THE STOCK IN THE PAPER BEATER TO FORM A RELATIVELY THICK PULP CARRYING ALL THE MATERIALS OF THE STOCK, THINNING THE PULP WITH WATER TO ABOUT SEVENTENTHS OF ONE PERCENT TO ONE PERCENT OF FIBER SO THAT ADVENTITIOUS MATERIAL MAY BE SEPARATE OUT, THICKENING THE FIBROUS PULP, EXPRESSING WATER FROM THE FIBROUS PULP TO REACH A PERCENTAGE TO ABOUT SIXTY TO SEVENTY PERCENT OF WATER AND THIRTY TO FORTY PERCENT OF PULP, PUTTING THE THICKENED PULP THROUGH A DEFIBRATION ACTION AT AN ELEVATED TEMPERATURE ABOVE THE BOILING POINT OF WATER AND IN THE PRESENCE OF STEAM UNDER PRESSURAE OF ABOUT FORTY-FIVE
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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) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |