US2992155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing rayon pulp of high purity from bagasse
Assignee: Individual
•
Filing: 1956-11-06
•
Granted: 1961-07-11
•
Expires: 1976-11-06
Abstract
No abstract record available.
Inventors
- 👤 Okuno Hiroshi
- 👤 Okuno Takasuke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:03
CPC Classifications
D; D21; D21C; D21C5/00; D21C1/00; D21C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN THE PROCESS OF MANUFACTURING RAYON PULP OF HIGH PURTITY FROM BAGASSE, THE STEPS WHICH COMPRISES LOOSENING RAW BAGASSE AND SCREENING THE LOOSENED DRY BAGASSE IN THE DRY STATE TO REMOVE THE PITH POWDER, PREPARING A FRESH ACETIC ACID SOLUTION OF A CONCENTRATION OF 0.05 TO 0.2%, BOILING THE FIBERS RECOVERED FROM THE SCREENING STEP IN SAID SOLUTION TO REMOVE PENTOSAN AND SILICIC ACID, AND TREATING THE BOILED FIBERS WITH A CAUSTIC SODA SOLUTION.
Claim 2
Dependent Claim
74 words
IN THE PROCESS OF MANUFACTURING RAYON PULP OF HIGH PURTITY FROM BAGASSE, THE STEPS WHICH COMPRISES LOOSENING RAW BAGASSE AND SCREENING THE LOOSENED DRY BAGASSE IN THE DRY STATE TO REMOVE THE PITH POWDER, PREPARING A FRESH ACETIC ACID SOLUTION OF A CONCENTRATION OF 0.05 TO 0.2%, BOILING THE FIBERS RECOVERED FROM THE SCREENING STEP IN SAID SOLUTION TO REMOVE PENTOSAN AND SILICIC ACID, AND TREATING THE BOILED FIBERS WITH A CAUSTIC SODA SOLUTION.
References Cited (Backward Citations)
CA461954A
Cited
US659784A
Cited
US1509273A
Cited
DE395119C
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US1817972A
Cited
GB322763A
Cited
US1918250A
Cited
US1838326A
Cited
US1847050A
Cited
US2106797A
Cited
GB594835A
Cited
US2625474A
Cited
US2645633A
Cited
US2731345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |