US2582496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deinking and bleaching of paper
Assignee: ST Regis Paper Co
•
Filing: 1947-10-09
•
Granted: 1952-01-15
•
Expires: 1967-10-09
Abstract
No abstract record available.
Inventors
- 👤 Peter J Massey
- 👤 Frederic C Goodwill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:46
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
91 words
A PROCESS FOR REMOVING PRINTER''S INK FROM ORINTED PAPER STOCK TO FORM A PULP FOR REUSE IN PAPER MAKING, WHICH COMPRISES: SUBJECTING SUCH STOCK TO A PULPING TREATMENT IN HOT, AQUEOUS, DE-INKING MEDIUM SUCH AS TO PRODUCE A PULP CONSISTENCY OF ABOUT 3 TO 5%, SAID MEDIUM CONTAINING AS DE-INKING REAGENTS ABOUT 0.8 TO 5% OF SODIUM PEROXIDE AND ABOUT 4 TO 8% OF SODIUM SILICATE HAVING A MOLECULAR RATIO OF SODIUM OXIDE TO SILICA WITHIN LIMITS OF ABOUT 1:1.4 TO 1:3, SAID REAGENT PERCENTAGES BEING BY WEIGHT OF THE DRY
Claim 2
Dependent Claim
91 words
A PROCESS FOR REMOVING PRINTER''S INK FROM ORINTED PAPER STOCK TO FORM A PULP FOR REUSE IN PAPER MAKING, WHICH COMPRISES: SUBJECTING SUCH STOCK TO A PULPING TREATMENT IN HOT, AQUEOUS, DE-INKING MEDIUM SUCH AS TO PRODUCE A PULP CONSISTENCY OF ABOUT 3 TO 5%, SAID MEDIUM CONTAINING AS DE-INKING REAGENTS ABOUT 0.8 TO 5% OF SODIUM PEROXIDE AND ABOUT 4 TO 8% OF SODIUM SILICATE HAVING A MOLECULAR RATIO OF SODIUM OXIDE TO SILICA WITHIN LIMITS OF ABOUT 1:1.4 TO 1:3, SAID REAGENT PERCENTAGES BEING BY WEIGHT OF THE DRY
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) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |