Patent US3020178A successfully refreshed from Google Patents.
US3020178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper impregnating compositions, impregnated papers and the process of impregnating paper
Assignee: Rohm and Haas Co
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Filing: 1957-09-06
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Granted: 1962-02-06
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Expires: 1977-09-06
Abstract
No abstract record available.
Inventors
- 👤 Edward J Sweeney
- 👤 Walter W Toy
- 👤 Paul J Mclaughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:44
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A METHOD WHICH COMPRISES IMPREGGNATING THROUGHOUT ITS MASS A POROUS FIBROUS SATURATING PAPER SHEET OF 5 TO 250 MILES THICKNESS FORMED OF CELLULOSIC FIBERS HAVING A CANADIAN FREENESS VALUE OF AT LEAST 450 WITH AN AQUEOUS DISPERSION CONTAINING 5 TO 60% BY WEIGHT OF A WATERINSOLUABLE POLYMER OF AN ARCYLIC SATER SELECTED FROM THE GROUP CONSISTING OF POLYMERS OF METHYL ACRYLATE AND ETHYL ACRYLA TE, COPOLYMERS OF ACRYLIC ACID ESTER OF ALCOHOLS HAVING 1 TO 4 CARBON ATOMS WITH EACH OTHER AND COPOLYMERS OF AN ACRYLIC ACID ESTER OF AN ALCOHOL HAVING FROM 1 TO 4 CARBON ATOMS WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, PROPYL, AND BUTYL METHACRYLATES, STYRENE, ARCYLONTRILE, METHACRYLOMITRILE, VINYL ACETATE, VINYL CHLORIDE, AND VINYLIDINE CHLORIDE, SAID POLYMER HAVING A T1 BETWEEN -17*C. AND +17*C. AND A MOLECULAR WEIGHT BETWEEN ABOUT 20,000 AND 950,000, AND SUBSTANTIALLY DRYING THE IMPREGNATED SHEET.
Claim 2
Independent Claim
147 words
A METHOD WHICH COMPRISES IMPREGGNATING THROUGHOUT ITS MASS A POROUS FIBROUS SATURATING PAPER SHEET OF 5 TO 250 MILES THICKNESS FORMED OF CELLULOSIC FIBERS HAVING A CANADIAN FREENESS VALUE OF AT LEAST 450 WITH AN AQUEOUS DISPERSION CONTAINING 5 TO 60% BY WEIGHT OF A WATERINSOLUABLE POLYMER OF AN ARCYLIC SATER SELECTED FROM THE GROUP CONSISTING OF POLYMERS OF METHYL ACRYLATE AND ETHYL ACRYLA TE, COPOLYMERS OF ACRYLIC ACID ESTER OF ALCOHOLS HAVING 1 TO 4 CARBON ATOMS WITH EACH OTHER AND COPOLYMERS OF AN ACRYLIC ACID ESTER OF AN ALCOHOL HAVING FROM 1 TO 4 CARBON ATOMS WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, PROPYL, AND BUTYL METHACRYLATES, STYRENE, ARCYLONTRILE, METHACRYLOMITRILE, VINYL ACETATE, VINYL CHLORIDE, AND VINYLIDINE CHLORIDE, SAID POLYMER HAVING A T1 BETWEEN -17*C. AND +17*C. AND A MOLECULAR WEIGHT BETWEEN ABOUT 20,000 AND 950,000, AND SUBSTANTIALLY DRYING THE IMPREGNATED SHEET.
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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) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |