Patent US4688088A successfully refreshed from Google Patents.
US2949397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral filled paper
Assignee: Warren SD Co
•
Filing: 1955-06-13
•
Granted: 1960-08-16
•
Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 Tyrrell H Werner
- 👤 William H Marra
- 👤 Warren B Gilman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:22
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/006; B; B64; B64D; B64D37/00; B64D37/02; B64D37/06; C; C08; C08B; C08B37/00; C08B37/006; C08B37/0087; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/69
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN A METHOD OF MAKING MINERAL-FILLED PAPER THE STEPS WHICH CONSIST IN COATING FINELY DIVIDED MINERAL FILLER PARTICLES WITH AN AQUEOUS COLLOIDAL DISPERSION OF PLANT MUCILAGE IN THE FORM OF A SUBSTITUTED MANNAN SELECTED FROM THE GROUP CONSISTING OF MANNO-GALACTANS AND GULCOMANNANS BY MIXING AN AQUEOUS COLOIDAL DISPERSION OF THE SUBSTITUTED MANNAN AND THE MINERAL FILLER PARTICLES, FORMING AN AQUEOUS PULP SUSPENSION CONTAINING CELLULOSE FIBERS, INTIMATELY MIXING THE COATED FINELY DIVIDED MINERAL FILLER PARTICLES WITH THE SAID AQUEOUS PULP SUSPENSION OF CELLULOSE FIBERS WHEREBY THE SAID COATED FINELY DIVIDED MINERAL FILLER PARTICLES ARE ATTRACTED TO THE CELLULOSE FIBERS AND ARE RETAINED IN THE SAID PULP IN THE ABSENCE OF ALUM AND ITS DECOMPOSITION PRODUCTS AND FORMING THE PULP AND INCLUDED MINERAL FILLER INTO A PAPER WEB ON A PAPER WEB-FORMING WIRE WHILE DRAINING SURPLUS WATER THEREFROM.
Claim 2
Dependent Claim
136 words
IN A METHOD OF MAKING MINERAL-FILLED PAPER THE STEPS WHICH CONSIST IN COATING FINELY DIVIDED MINERAL FILLER PARTICLES WITH AN AQUEOUS COLLOIDAL DISPERSION OF PLANT MUCILAGE IN THE FORM OF A SUBSTITUTED MANNAN SELECTED FROM THE GROUP CONSISTING OF MANNO-GALACTANS AND GULCOMANNANS BY MIXING AN AQUEOUS COLOIDAL DISPERSION OF THE SUBSTITUTED MANNAN AND THE MINERAL FILLER PARTICLES, FORMING AN AQUEOUS PULP SUSPENSION CONTAINING CELLULOSE FIBERS, INTIMATELY MIXING THE COATED FINELY DIVIDED MINERAL FILLER PARTICLES WITH THE SAID AQUEOUS PULP SUSPENSION OF CELLULOSE FIBERS WHEREBY THE SAID COATED FINELY DIVIDED MINERAL FILLER PARTICLES ARE ATTRACTED TO THE CELLULOSE FIBERS AND ARE RETAINED IN THE SAID PULP IN THE ABSENCE OF ALUM AND ITS DECOMPOSITION PRODUCTS AND FORMING THE PULP AND INCLUDED MINERAL FILLER INTO A PAPER WEB ON A PAPER WEB-FORMING WIRE WHILE DRAINING SURPLUS WATER THEREFROM.
References Cited (Backward Citations)
US566497A
Cited
US1448847A
Cited
US1839346A
Cited
US2322185A
Cited
US2287153A
Cited
US2325051A
Cited
GB682664A
Cited
US2644749A
Cited
US2644763A
Cited
US2698793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |