Patent US2666699A successfully refreshed from Google Patents.
US2666699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precipitating size with chromium and aluminum salts
Assignee: 3M Co
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Filing: 1947-01-06
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Granted: 1954-01-19
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Expires: 1967-01-06
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Mcquiston
- 👤 Frank E Davenport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:38
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/22; D21H17/33; D21H17/34; D21H17/35; D21H17/63; D21H17/66; D21H23/00; D21H23/76; D21H23/765
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A METHOD OF PREPARING AN AQUEOUS FIBROCOLLOIDAL SLURRY ADAPTED FOR USE IN MAKING UNIFIED SHEET MATERIAL ON A PAPER-MAKING MACHINE, COMPRISING THE STEPS OF: (1) DISPERSING CELLULOSE PAPER-MAKING FIBERS IN WATER TO FORM A FIBROUS SLURRY, (2) CONDITIONING THE FIBERS BY INTRODUCING SMALL PROPORTIONS OF CHROMIC SULPHATE AND ALUMINUM SULPHATE, (3) ALKALIZING THE SLURRY TO A PH VALUE IN THE RANGE OF 10.0 TO ABOUT 11.0, (4) ADMIXING A COLLOIDAL BINDER POLYMER LATEX, (5) INTRODUCING A SMALL ADDITIONAL PROPORTION OF CHROMIC SULPHATE, THE AMOUNTS OF SALTS THUS FAR INTRODUCED BEING INSUFFICIENT TO DEPOSIT THE LATEX PARTICLES UPON THE FIBERS, (6) INTRODUCING ALUMINUM SULPHATE IN SUFFICIENT AMOUNT TO DEPOSIT THE LATEX PARTICLES UPON THE FIBERS AND ADJUSTING THE PH VALUE TO APPROXIMATELY 4.8-5.2.
Claim 2
Independent Claim
122 words
A METHOD OF PREPARING AN AQUEOUS FIBROCOLLOIDAL SLURRY ADAPTED FOR USE IN MAKING UNIFIED SHEET MATERIAL ON A PAPER-MAKING MACHINE, COMPRISING THE STEPS OF: (1) DISPERSING CELLULOSE PAPER-MAKING FIBERS IN WATER TO FORM A FIBROUS SLURRY, (2) CONDITIONING THE FIBERS BY INTRODUCING SMALL PROPORTIONS OF CHROMIC SULPHATE AND ALUMINUM SULPHATE, (3) ALKALIZING THE SLURRY TO A PH VALUE IN THE RANGE OF 10.0 TO ABOUT 11.0, (4) ADMIXING A COLLOIDAL BINDER POLYMER LATEX, (5) INTRODUCING A SMALL ADDITIONAL PROPORTION OF CHROMIC SULPHATE, THE AMOUNTS OF SALTS THUS FAR INTRODUCED BEING INSUFFICIENT TO DEPOSIT THE LATEX PARTICLES UPON THE FIBERS, (6) INTRODUCING ALUMINUM SULPHATE IN SUFFICIENT AMOUNT TO DEPOSIT THE LATEX PARTICLES UPON THE FIBERS AND ADJUSTING THE PH VALUE TO APPROXIMATELY 4.8-5.2.
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |