Patent US3029181A successfully refreshed from Google Patents.
US3029181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the opacity of cellulose fibers
Assignee: Individual
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Filing: 1959-05-18
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Granted: 1962-04-10
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Expires: 1979-05-18
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:48
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/70; D21H17/67; D21H17/675
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
THE METHOD OF INCREASING THE OPACITY OF CELLULOSE FIBER WHICH COMPRISES; SATURATING SAID FIBERS WITH A SOLUTION OF ZINC SULPHATE CONTAINING FROM 5% TO 20% OF SAID SALT; REMOVING SUCH A PORTION OF THE SATURATING SOLUTION THAT THE MOISTURE CONTENT OF THE RESULTING FIBER SHALL BE BETWEEN 30% AND 70%; COMMINGLING WITH SAID MOIST FIBERS SUFFICIENT AMOUNT OF A SOULATION OF AMMONIUM SULPHIDE TO PRECIPITATE ALL RESIDENT ZINC AS THE SULPHIDE; WASH-
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) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |