US3253978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming an inorganic waterlaid sheet containing colloidal silica and cationic starch
Assignee: C H Dexter & Sons Inc
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Filing: 1964-08-31
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Granted: 1966-05-31
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Expires: 1984-08-31
Abstract
No abstract record available.
Inventors
- 👤 Warren J Bodendorf
- 👤 Fay H Osborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:56
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/29; B; B44; B44C; B44C1/00; B44C1/16; B44C1/165; B44C1/17; B44C1/1712; D21H13/00; D21H13/36; D21H13/38; D21H17/63; D21H17/67; D21H17/68; D21H23/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31634
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
THE METHOD OF FORMING AN INORGANIC SHEET COMPRISING FORMING A SUBSTANTIALLY HOMOGENEOUS AQUEOUS SLURRY OF INORGANIC PARTICLES AND COLLOIDAL SILICA; FEEDING SAID SLURRY TO THE HEADBOX OF A PAPERMAKING MACHINE WHILE SIMULTANEOUSLY FEEDING THEREWITH A SOLUTION OF A CATIONIC STARCH TO FORM A MIXTURE WITH SAID SLURRY, SAID CATIONIC STARCH SOLUTION ADMIXING WITH SAID SLURRY SHORTLY BEFORE DEPOSITION OF THE INORGANIC PARTICLES UPON THE WIRE OF THE PAPERMAKING MACHINE AND BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE ABOUT 0.5-10.0 PERCENT BY WEIGHT OF THE SOLIDS IN SAID SLURRY; AND CAUSING SAID MIXTURE TO DEPOSIT UPON THE SCREEN OF A PAPERMAKING MACHINE TO FORM A WEB HAVING THE INORGANIC PARTICLES FIRMLY BONDED TO GETHER WITH COLLOIDAL SILICA UNIFORMLY DISTRIBUTED ACROSS THE SURFACES OF THE INORGANIC PARTICLES.
Claim 2
Independent Claim
126 words
THE METHOD OF FORMING AN INORGANIC SHEET COMPRISING FORMING A SUBSTANTIALLY HOMOGENEOUS AQUEOUS SLURRY OF INORGANIC PARTICLES AND COLLOIDAL SILICA; FEEDING SAID SLURRY TO THE HEADBOX OF A PAPERMAKING MACHINE WHILE SIMULTANEOUSLY FEEDING THEREWITH A SOLUTION OF A CATIONIC STARCH TO FORM A MIXTURE WITH SAID SLURRY, SAID CATIONIC STARCH SOLUTION ADMIXING WITH SAID SLURRY SHORTLY BEFORE DEPOSITION OF THE INORGANIC PARTICLES UPON THE WIRE OF THE PAPERMAKING MACHINE AND BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE ABOUT 0.5-10.0 PERCENT BY WEIGHT OF THE SOLIDS IN SAID SLURRY; AND CAUSING SAID MIXTURE TO DEPOSIT UPON THE SCREEN OF A PAPERMAKING MACHINE TO FORM A WEB HAVING THE INORGANIC PARTICLES FIRMLY BONDED TO GETHER WITH COLLOIDAL SILICA UNIFORMLY DISTRIBUTED ACROSS THE SURFACES OF THE INORGANIC PARTICLES.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |