Patent US2665983A successfully refreshed from Google Patents.
US2665983A
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US
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Method of sizing paper
Assignee: Shell Development Co
•
Filing: 1948-08-02
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Granted: 1954-01-12
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Expires: 1968-08-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur B Bakalar
- 👤 Robert D Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:22
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/10; D21H17/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS OF SIZING PAPER PULP WHICH COMPRISES CONTACTING AN AQUEOUS SLURRY OF THE PULP WITH AN AQUEOUS EMULSION OF A HYDROCARBON HAVING A VISCOSITY OF 400 TO 50,000 SUS AT 210* F. CONTAINING 0.05% TO 5% BY WEIGHT OF SAID HYDROCARBON OF A POLYPHOSPHORIC ACID COMPOUND TOGETHER WITH MUTUAL SOLVENT FOR SAID POLYPHOSPHORIC ACID COMPOUND AND HYDROCARBON, AND ADDING AN ACIDIC AGENT TO PRECIPITATE SAID EMULSION ON THE PULP.
Claim 2
Dependent Claim
70 words
A PROCESS OF SIZING PAPER PULP WHICH COMPRISES CONTACTING AN AQUEOUS SLURRY OF THE PULP WITH AN AQUEOUS EMULSION OF A HYDROCARBON HAVING A VISCOSITY OF 400 TO 50,000 SUS AT 210* F. CONTAINING 0.05% TO 5% BY WEIGHT OF SAID HYDROCARBON OF A POLYPHOSPHORIC ACID COMPOUND TOGETHER WITH MUTUAL SOLVENT FOR SAID POLYPHOSPHORIC ACID COMPOUND AND HYDROCARBON, AND ADDING AN ACIDIC AGENT TO PRECIPITATE SAID EMULSION ON THE PULP.
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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) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |