Patent US2697661A successfully refreshed from Google Patents.
US2697661A
Expired / Lapsed
US
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Digestion of pulp
Assignee: Alton Box Board Co
•
Filing: 1946-07-31
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Granted: 1954-12-21
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Expires: 1966-07-31
Abstract
No abstract record available.
Inventors
- 👤 Robert F Hollis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:24
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/32; D21J; D21J1/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN THE ART OF MAKING PAPERBOARD FROM WASTE PAPER CONTAINING ASPHALTIC CONTAMINANTS, THE PROCESS OF DISPERSING THE ASPHALTIC CONTAMINANTS AS MINUTE SPECKS COMPRISING, PREPARING AN AQUEOUS STOCK FROM WASTE WATER CONTAINING ASPHALTIC CONTAMINANTS, THICKENING THE STOCK TO A CONSISTENCY OF AT LEAST 6%, HEATING THE THICKENED STOCK TO A TEMPERATURE IN THE RANGE OF 200*-450* F. WHILE MAINTAINING A PRESSURE THEREON SUFFICIENT TO MAINTAIN THE WATER IN THE STOCK LIQUID, MECHANICALLY WORKING THE STOCK WHILE UNDER SUCH TEMPERATURE AND PRESSURE, AND CHILLING THE STOCK IMMEDIATELY AS IT EMERGES FROM SUCH MECHANICAL WORKING.
Claim 2
Dependent Claim
92 words
IN THE ART OF MAKING PAPERBOARD FROM WASTE PAPER CONTAINING ASPHALTIC CONTAMINANTS, THE PROCESS OF DISPERSING THE ASPHALTIC CONTAMINANTS AS MINUTE SPECKS COMPRISING, PREPARING AN AQUEOUS STOCK FROM WASTE WATER CONTAINING ASPHALTIC CONTAMINANTS, THICKENING THE STOCK TO A CONSISTENCY OF AT LEAST 6%, HEATING THE THICKENED STOCK TO A TEMPERATURE IN THE RANGE OF 200*-450* F. WHILE MAINTAINING A PRESSURE THEREON SUFFICIENT TO MAINTAIN THE WATER IN THE STOCK LIQUID, MECHANICALLY WORKING THE STOCK WHILE UNDER SUCH TEMPERATURE AND PRESSURE, AND CHILLING THE STOCK IMMEDIATELY AS IT EMERGES FROM SUCH MECHANICAL WORKING.
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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) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |