US3556930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making wet-strength paper and product thereof
Assignee: OI Glass Inc
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Filing: 1968-02-29
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Granted: 1971-01-19
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Expires: 1988-02-29
Abstract
Abstract A PAPER WEB CONTAINING 1-20 PRECENT OF A THERMOSETTING RESIN SUCH AS PHENOL OR UREA FORMALDEHYDE AND 0.1-4 PRECENT OF A CHROMIUM COORDINATION COMPLEX OF A FLUOROHYDROCARBON WHICH IS DISSOLVED IN A SOLVENT IS IMMERSED IN A BATH OF MOLTEN WAX. FROM 5-40% OF THE WAX IS PICKED UP ON THE PAPER WEB; THE HEAT OF SAID WAX ALSO HELPS TO CURE THE THERMOSETTING RESIN. THE FLUOROHYDROCARBON IS ADDED TO THE WEB CONTAINING THE RESIN AT ANY STAGE IN THE PAPERMAKING PROCESS PRIOR TO THE WAX IMPREGNATION. THE FLUOROHYDROCARBON ADDITION GENERALLY IMPARTS TO THE PAPER WEB THE ABILITY LIMIT THE WAX PICK-UP AND CONTROLS ITS DISTRIBUTION ON THE PAPER WEB.
Inventors
- 👤 Gus S Scarvelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:11
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48; D21H17/03; D21H17/05; D21H17/12; D21H17/49; D21H17/50; D21H17/60
Claims Analysis
Total Claims: 0
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |