Patent US3074913A successfully refreshed from Google Patents.
US3074913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of filament and film-
Assignee: —
•
Filing: 1961-01-27
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Granted: 1963-01-22
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Expires: 1981-01-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:07
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/86; C08G63/863
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
AN IMPROVED PROCESS FOR THE MANUFACTURE OF FIBER AND FILM-FORMING HIGHLY POLYMERIC POLYMETHYLENE TEREPHTHALATES WHICH COMPRISES THE STEP OF POLYCONDENSING A BIS-(HYDROXYALKYL) TEREPHLATE CHARACTERIZED BY USING AS A CATALYST FOR THE POLYCONDENSATION REACTION, A MEMBER OF THE GROUP CONSISTING OF COMPOUNDS OF GERMANIUM WHICH ARE READILY SOLUBLE IN THE REACTION MIXTURE AND COMPOUNDS OF GERMANIUM WHICH READILY FORM A SOLUTION IN GLYCOL WHICH IS MISCIBLE WITH THE POLYCONDENSATION REACTION MIXTURE, SAID GERMANIUM COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF LOWER ALKOXIDES OF GERMANIUM AND GERMANIUM TERACHLORIDE.
Claim 2
Dependent Claim
87 words
AN IMPROVED PROCESS FOR THE MANUFACTURE OF FIBER AND FILM-FORMING HIGHLY POLYMERIC POLYMETHYLENE TEREPHTHALATES WHICH COMPRISES THE STEP OF POLYCONDENSING A BIS-(HYDROXYALKYL) TEREPHLATE CHARACTERIZED BY USING AS A CATALYST FOR THE POLYCONDENSATION REACTION, A MEMBER OF THE GROUP CONSISTING OF COMPOUNDS OF GERMANIUM WHICH ARE READILY SOLUBLE IN THE REACTION MIXTURE AND COMPOUNDS OF GERMANIUM WHICH READILY FORM A SOLUTION IN GLYCOL WHICH IS MISCIBLE WITH THE POLYCONDENSATION REACTION MIXTURE, SAID GERMANIUM COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF LOWER ALKOXIDES OF GERMANIUM AND GERMANIUM TERACHLORIDE.
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |