US2616818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper coating
Assignee: Hercules Powder Co
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Filing: 1948-11-18
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Granted: 1952-11-04
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Expires: 1968-11-18
Abstract
No abstract record available.
Inventors
- 👤 Julian L Azorlosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:32
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/58; C; C08; C08F; C08F8/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31667
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
IN A PROCESS FOR PREPARING A COATED PAPER, THE STEP COMPRISING APPLYING TO A PREFORMED PAPER WEB AN AQUEOUS DISPERSION OF CLAY CONTAINING BETWEEN 30% AND ABOUT 70% TOTAL SOLIDS AND AS AN ADHESIVE BETWEEN ABOUT 5% AND ABOUT 15%, BASED ON THE WEIGHT OF CLAY, OF A WATER-SOLUBLE POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYACRYLAMIDE AND COPOLYMERS OF ACRYLAMIDE AND A COPOLYMERIZABLE MONOMER IN WHICH THE MOLAR PROPORTIONS OF ACRYLAMIDE TO THE OTHER MONOMER ARE AT LEAST 2 TO 1, SAID DISPERSION CONTAINING GLYOXAL TO RENDER THE ADHESIVE SUBSTANTIALLY INSOLUBLE IN WATER.
References Cited (Backward Citations)
US2078881A
Cited
GB475671A
Cited
US2173005A
Cited
US2287161A
Cited
US2343095A
Cited
US2469696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |