Patent US6387380B1 successfully refreshed from Google Patents.
US2773281A
Expired / Lapsed
US
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Method and apparatus for spinning high strength silk from cuprammonium cellulose solutions
Assignee: JP Bemberg AG
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Filing: 1953-04-07
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Granted: 1956-12-11
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Expires: 1973-04-07
Abstract
No abstract record available.
Inventors
- 👤 Viktor Elsaesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:30
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/12; D01D5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
THE METHOD OF PRODUCING FILAMENTS OF HIGH TENSILE STRENGTH FROM CUPRAMMONIUM CELLULOSE SOLUTIONS WHICH COMPRISES PASSING THE FILAMENTS INTO A FUNNEL SHAPED BATH, ALLOWING THE FILAMENTS TO PARTIALLY COAGULATE IN SAID BATH SO THAT AT THE END OF THE BATH THE FILAMENTS HAVE AN OPTIMUM VISCOSITY OF 50,000 TO 60,000 POISES, PASSING THE FILAMENTS INTO A SECOND BATH, SUBJECTING THE FILAMENTS TO THE ACTION OF BRAKING MEANS FOR THE FILAMENTS SO AS TO INCREASE THE LENGTH OF TRAVEL AND UNIFORMLY APPLY STRETCHING TENSION, AND DRAWING OFF THE FILAMENTS AT THE END OF THE SECOND BATH AT MORE THAN TWICE THE SPEED OF THE FILAMENTS AT OPTIMUM VISCOSITY WHEREBY THE FILAMENTS HAVE BEEN STRETCHED TO LESS THAN HALF THEIR SECTION AT THE POINT OF OPTIMUM VISCOSITY, THE LENGTH OF FILAMENT PATH IN SAID SECOND BATH AND THE DRAWING OFF VELOCITY BEING SUCH THAT THE TIME OF FILAMENT PASSAGE FROM THE POINT OF OPTIMUM VISCOSITY THROUGH THE SECOND BATH IS AT LEAST 0.6 SECOND.
Claim 2
Independent Claim
162 words
THE METHOD OF PRODUCING FILAMENTS OF HIGH TENSILE STRENGTH FROM CUPRAMMONIUM CELLULOSE SOLUTIONS WHICH COMPRISES PASSING THE FILAMENTS INTO A FUNNEL SHAPED BATH, ALLOWING THE FILAMENTS TO PARTIALLY COAGULATE IN SAID BATH SO THAT AT THE END OF THE BATH THE FILAMENTS HAVE AN OPTIMUM VISCOSITY OF 50,000 TO 60,000 POISES, PASSING THE FILAMENTS INTO A SECOND BATH, SUBJECTING THE FILAMENTS TO THE ACTION OF BRAKING MEANS FOR THE FILAMENTS SO AS TO INCREASE THE LENGTH OF TRAVEL AND UNIFORMLY APPLY STRETCHING TENSION, AND DRAWING OFF THE FILAMENTS AT THE END OF THE SECOND BATH AT MORE THAN TWICE THE SPEED OF THE FILAMENTS AT OPTIMUM VISCOSITY WHEREBY THE FILAMENTS HAVE BEEN STRETCHED TO LESS THAN HALF THEIR SECTION AT THE POINT OF OPTIMUM VISCOSITY, THE LENGTH OF FILAMENT PATH IN SAID SECOND BATH AND THE DRAWING OFF VELOCITY BEING SUCH THAT THE TIME OF FILAMENT PASSAGE FROM THE POINT OF OPTIMUM VISCOSITY THROUGH THE SECOND BATH IS AT LEAST 0.6 SECOND.
References Cited (Backward Citations)
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US1828497A
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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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |