US2743178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for de-inking printed waste paper
Assignee: KRODEL
•
Filing: 1948-07-19
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Granted: 1956-04-24
•
Expires: 1968-07-19
Abstract
No abstract record available.
Inventors
- 👤 William J Krodel
- 👤 Hackerman Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:10
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; D21C5/025; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
THE PROCESS OF DE-INKING PRINTED MATERIAL WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF PRINTED AND SHREDDED WASTE NEWSPRINT STOCK MATERIAL, THEN ADDING TO THE SLURRY A WATER SOLUBLE SALT YIELDING AN ION HAVING A VALENCY OF AT LEAST 4, TO THEREBY INDUCED A ZETA POTENTIAL OF THE SAME CHARGE SIGN AS THE INK PARTICLES AND WHICH DIFFERS FROM THAT OF SIMILARLY CHARGED PARTICLES OF THE MATERIAL BY A FACTOR OF AT LEAST4, TO THEREBY EFFECT A SUBSTANTIAL SEPARATION OF THE INK PARTICLES FROM THE MATERIAL PARTICLES; THEN ADDING TO THE RESULTANT MASS A DETERGENT OF A SUITABLE TYPE TO EMULSIFY THE SEPARATED INK PARTICLES AND RETAIN THEM IN SUSPENSION AND SEPARATED FROM THE MATERIAL PARTICLES; THEN SUBJECTING SUCH MASS TO A TEMPERATURE OF 150-190* F. FOR A PERIOD OF 1/2-2 HOURS AND AGITATING THE MASS DURING SAID PERIOD; AND THEN REMOVING THE SEPARATED INK PARTICLES FROM THE SLURRY AND MASS WITH THE WATER.
Claim 2
Dependent Claim
153 words
THE PROCESS OF DE-INKING PRINTED MATERIAL WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF PRINTED AND SHREDDED WASTE NEWSPRINT STOCK MATERIAL, THEN ADDING TO THE SLURRY A WATER SOLUBLE SALT YIELDING AN ION HAVING A VALENCY OF AT LEAST 4, TO THEREBY INDUCED A ZETA POTENTIAL OF THE SAME CHARGE SIGN AS THE INK PARTICLES AND WHICH DIFFERS FROM THAT OF SIMILARLY CHARGED PARTICLES OF THE MATERIAL BY A FACTOR OF AT LEAST4, TO THEREBY EFFECT A SUBSTANTIAL SEPARATION OF THE INK PARTICLES FROM THE MATERIAL PARTICLES; THEN ADDING TO THE RESULTANT MASS A DETERGENT OF A SUITABLE TYPE TO EMULSIFY THE SEPARATED INK PARTICLES AND RETAIN THEM IN SUSPENSION AND SEPARATED FROM THE MATERIAL PARTICLES; THEN SUBJECTING SUCH MASS TO A TEMPERATURE OF 150-190* F. FOR A PERIOD OF 1/2-2 HOURS AND AGITATING THE MASS DURING SAID PERIOD; AND THEN REMOVING THE SEPARATED INK PARTICLES FROM THE SLURRY AND MASS WITH THE WATER.
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) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |