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Patent US3753661A successfully refreshed from Google Patents.
US3753661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the preparation of filamentary material
Assignee: Celanese Corp
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Filing: 1971-02-08
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Granted: 1973-08-21
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Expires: 1991-02-08
Abstract
Abstract Apparatus for the manufacture of linear condensation polymers of increased relative viscosity employing in combination a means for feeding pre-formed particulate polymeric material of lower viscosity to a heating means which heats the material to a temperature lower than its melting point and subsequently passing the heated particulate material to a melting means for melting the particulate material whereby the melted material can be extruded.
Inventors
- 👤 F Simons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:46
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/04; D; D01; D01D; D01D1/00; D01D1/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
34 words
The apparatus of claim 1 wherein said melter has a melt chamber below said feed screw means and a chip receiving melt grid member disposed intermediate said screw feed means and said melt chamber.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |