US3619347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of wastepaper treated with urea or the like resins to impart wet strength
Assignee: Salvox Mfg Co
•
Filing: 1969-03-13
•
Granted: 1971-11-09
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Expires: 1989-03-13
Abstract
Abstract Wastepaper treated typically with urea resins or the like to impart high wet strength is recovered by treating it in a standard paper pulper in an aqueous medium with a mixture of sulfuric and phosphoric acid and, advantageously, an emulsifying agent.
Inventors
- 👤 Glen V Ireland Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:18
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
The process of claim 1 wherein the composition consists essentially of about 86 percent sulfuric acid, about 7 percent phosphoric acid and about 7 percent emulsifier.
Claim 2
Dependent Claim
18 words
The process of claim 1, the composition further containing as an anticorrosive agent ethylene oxide ether of dehydroabietylamine.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the emulsifying agent is an alkylene oxide ether of an alkyl phenol.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein a metal corrosion inhibitor is used and the separated pulp is washed to remove separated contaminants.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the said acidic component is about 2-5 percent of the weight of said waste paper.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |