Patent JPH11118925A successfully refreshed from Google Patents.
US2780512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for producing hollow filaments of regenerated cellulose
Assignee: Individual
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Filing: 1954-04-16
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Granted: 1957-02-05
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Expires: 1974-04-16
Abstract
No abstract record available.
Inventors
- 👤 Inoshita Kagenobu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:10
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; D01D5/247; D01D5/253
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR THE MANUFACTURE OF HOLLOW FILAMENTS OF REGENERATED CELLULOSE WHICH COMPRISES SPINNING VISCOSE HAVING A HOTTENROTH NUMBER NOT LESS THAN 8, ANALYZING FROM 33 TO 45% CARBON DISULFIDE BASED ON CELLULOSE, FROM 5 TO 9% SODIUM HYDROXIDE BASED ON VICOSE AND FROM 6 TO 9% CELLULOSE AND CONTAINING ADDED SUBSTANCE OF FROM 0.1 TO 3% BASED ON VICOSE SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, STRONTIUM CARBONATE, BARIUM CARBONATE AND MIXTURES OF SAID CARBONATES IN THE FORM OF FINE PARTICLES, IN A SPINNING BATH HAVING A TEMPERATURE BETWEEN 40 TO 70* C. AND CONTAINING 90-180 G./L. OF SULPHURIC ACID, 200-350 G./L. OF SODIUM SULFATE AND 5-80 G./L. OF ZINC SULFATE.
Claim 2
Dependent Claim
113 words
A PROCESS FOR THE MANUFACTURE OF HOLLOW FILAMENTS OF REGENERATED CELLULOSE WHICH COMPRISES SPINNING VISCOSE HAVING A HOTTENROTH NUMBER NOT LESS THAN 8, ANALYZING FROM 33 TO 45% CARBON DISULFIDE BASED ON CELLULOSE, FROM 5 TO 9% SODIUM HYDROXIDE BASED ON VICOSE AND FROM 6 TO 9% CELLULOSE AND CONTAINING ADDED SUBSTANCE OF FROM 0.1 TO 3% BASED ON VICOSE SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, STRONTIUM CARBONATE, BARIUM CARBONATE AND MIXTURES OF SAID CARBONATES IN THE FORM OF FINE PARTICLES, IN A SPINNING BATH HAVING A TEMPERATURE BETWEEN 40 TO 70* C. AND CONTAINING 90-180 G./L. OF SULPHURIC ACID, 200-350 G./L. OF SODIUM SULFATE AND 5-80 G./L. OF ZINC SULFATE.
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) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |