Patent US1977629A successfully refreshed from Google Patents.
Patent US2780546A successfully refreshed from Google Patents.
US2780546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of preserved alkaline paper
Assignee: Dow Chemical Co
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Filing: 1955-08-26
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Granted: 1957-02-05
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Expires: 1975-08-26
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Moyle
- 👤 Charles G Humiston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:49
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN THE PROCESS FOR THE MANUFACTURE OF AN ALKALINE PAPER FROM DILUTE AQUEOUS PAPER PULP SUSPENSION, THE STEPS WHICH COMPRISE ADDING TO THE PULP SUSPENSION (1) A PENTACHLOROPHENOL COMPOUND IN AN AMOUNT NORMALLY ADAPTED TO ACCOMPLISH PRESERVATION AND (2) A LONG CHAIN ALIPHATIC AMINE COMPOUND HAVING AT LEAST ONE HYDROGEN ATTACHED TO THE AMINE NITROGEN AND CONTAINING FROM 10 TO 18 CARBON ATOMS, INCLUSIVE, IN THE AMOUNT OF AT LEAST 1.5 MOLES PER MOLE OF THE ADDED PHENOLIC COMPOUND, INTIMATELY MIXING THE RESULTING MODIFIED PULP SUSPENSION, AND FORMING THE DILUTE PULP SUSPENSION AT A PH OF FROM 7.2 TO 9.8 INTO A WATERLAID SHEET.
Claim 2
Dependent Claim
104 words
IN THE PROCESS FOR THE MANUFACTURE OF AN ALKALINE PAPER FROM DILUTE AQUEOUS PAPER PULP SUSPENSION, THE STEPS WHICH COMPRISE ADDING TO THE PULP SUSPENSION (1) A PENTACHLOROPHENOL COMPOUND IN AN AMOUNT NORMALLY ADAPTED TO ACCOMPLISH PRESERVATION AND (2) A LONG CHAIN ALIPHATIC AMINE COMPOUND HAVING AT LEAST ONE HYDROGEN ATTACHED TO THE AMINE NITROGEN AND CONTAINING FROM 10 TO 18 CARBON ATOMS, INCLUSIVE, IN THE AMOUNT OF AT LEAST 1.5 MOLES PER MOLE OF THE ADDED PHENOLIC COMPOUND, INTIMATELY MIXING THE RESULTING MODIFIED PULP SUSPENSION, AND FORMING THE DILUTE PULP SUSPENSION AT A PH OF FROM 7.2 TO 9.8 INTO A WATERLAID SHEET.
References Cited (Backward Citations)
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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) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |