US2907687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning spinnerettes
Assignee: Dow Chemical Co
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Filing: 1958-02-21
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Granted: 1959-10-06
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Expires: 1978-02-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Scigliano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:49
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
PROCEDURE FOR CLEANING SPINNERETTES AND THE LIKE EXTRUSION DEVICES TO RID THEM OF CONTAMINATING DEPOSITS OF A THERMOPLASTIC MELT SPINNABLE PLASTIC COMPOUND THAT IS INCOMPATIBLE WITH NORMALLY LIQUID WATER-SOLUBLE GLYCOLS AN POLYGLYCOLS WHICH THERMOPLASTIC COMPOUND HAS BEEN MELT SPUN THROUGH SAID SPINNERETTE, WHICH PROCEDURE COMPRISES IMMERSING THE CONTAMINATED SPINNERETTE IN A POLYCOL BATH MAINTAINED AT A TEMPERATURE IN EXCESS OF AT LEAST THE SOFTENING TEMPERATURE OF SAID THERMOPLASTIC COMPOUND OF A NORMALLY LIQUID, WATER-SOLUBLE POLYOL SELECTED FROM THE GROUP CONSISTING OF GLYCEROL, ETHYLENE GLYCOL, PROPYLENE GLYCOL, POLYGLYCOL DERIVATIVES OF ETHYLENE OXIDE CONTAINING OXYETHYLENE GROUPS, POLGLYCOL DERIVTIVES OF PROPYLENE OXIDE CONTAINING OXYPROPYLENE GROUPS, POLYGLYCOL DERIVATIVES OF ETHYLENE OXIDE AND PROPYLENE OXIDE CONTAINING MIXING OXYETHYLENE-OXYPROPYLENE GROUPS, AND MIXTURES THEREOF UNTIL THE PLASTIC COMPOUND ON SAID SPINNERETTE AT LEAST BEGINS TO SOFTEN; REMOVING THE HEATED SPINNERETTE FROM SAID HOT BATH; THEN QUENCHING THE SOTREATED SPINNERETTE WHILE HOT IN AN AQUEOUS BATH.
Claim 2
Dependent Claim
148 words
PROCEDURE FOR CLEANING SPINNERETTES AND THE LIKE EXTRUSION DEVICES TO RID THEM OF CONTAMINATING DEPOSITS OF A THERMOPLASTIC MELT SPINNABLE PLASTIC COMPOUND THAT IS INCOMPATIBLE WITH NORMALLY LIQUID WATER-SOLUBLE GLYCOLS AN POLYGLYCOLS WHICH THERMOPLASTIC COMPOUND HAS BEEN MELT SPUN THROUGH SAID SPINNERETTE, WHICH PROCEDURE COMPRISES IMMERSING THE CONTAMINATED SPINNERETTE IN A POLYCOL BATH MAINTAINED AT A TEMPERATURE IN EXCESS OF AT LEAST THE SOFTENING TEMPERATURE OF SAID THERMOPLASTIC COMPOUND OF A NORMALLY LIQUID, WATER-SOLUBLE POLYOL SELECTED FROM THE GROUP CONSISTING OF GLYCEROL, ETHYLENE GLYCOL, PROPYLENE GLYCOL, POLYGLYCOL DERIVATIVES OF ETHYLENE OXIDE CONTAINING OXYETHYLENE GROUPS, POLGLYCOL DERIVTIVES OF PROPYLENE OXIDE CONTAINING OXYPROPYLENE GROUPS, POLYGLYCOL DERIVATIVES OF ETHYLENE OXIDE AND PROPYLENE OXIDE CONTAINING MIXING OXYETHYLENE-OXYPROPYLENE GROUPS, AND MIXTURES THEREOF UNTIL THE PLASTIC COMPOUND ON SAID SPINNERETTE AT LEAST BEGINS TO SOFTEN; REMOVING THE HEATED SPINNERETTE FROM SAID HOT BATH; THEN QUENCHING THE SOTREATED SPINNERETTE WHILE HOT IN AN AQUEOUS BATH.
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) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |