Patent US3419638A successfully refreshed from Google Patents.
US3419638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeable polypropylene
Assignee: Beaunit Corp
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Filing: 1962-02-14
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Granted: 1968-12-31
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Expires: 1982-02-14
Abstract
No abstract record available.
Inventors
- 👤 John F Fuzek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:35
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/44; D01F6/46; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/928
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
THE PROCESS OF SIMULTANEOUSLY IMPARTING DYE RECEPTIVITY TO POLYPROPYLENE AND SUBSTANTIALLY REDUCING THE MELT VISCOSITY THEREOF WHICH COMPRISES ADDING TO HIGH MELT VISCOSITY POLYPROPYLENE COMPRISING AT LEAST ABOUT 85% BY WEIGHT OF ISOTACTIC MACROMOLECULES AT LEAST ABOUT ONE PERCENT BY WEIGHT BASED UPON THE WEIGHT OF THE POLYPROPYLENE OF A POLYESTER SELECTED FROM THE GROUP CONSISTING OF A POLYALKYLENE TEREPHTHALATE, A RANDOM CO-POLYMER OF ETHYLENE TEREPHTHALATE AND ETHYLENE ISOPHTHALATE, AND A POLY(1,4-CYCLOHEXYLENEDIMETHYLENE TEREPHTHALATE), SAID POLYESTER HAVING A MELT VISCOSITY SUBSTANTIALLY LOWER THAN THAT OF SAID POLYPROPYLENE, AND FUSING SAID MIXTURE TO PRODUCE A HOMOGENOUS POLYPROPYLENE-POLYESTER BLEND.
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) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |