US3149095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of polyamides
Assignee: Bemberg SpA
•
Filing: 1961-08-07
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Granted: 1964-09-15
•
Expires: 1981-08-07
Abstract
No abstract record available.
Inventors
- 👤 Cerutti Giacomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:16
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD FOR THE PURIFICATION OF AN IMPURE SOLID, FILAMENT-FORMING LINEAR POLYAMIDE CONTAINING A POLYAMIDE-FORMING MONOMER AND LOW MOLECULAR WEIGHT POLYAMIDES AS IMPURITIES WHICH COMPRISES WASHING PARTICLES OF SAID SOLID POLYAMIDE WITH WATER AT AN ELEVATED TEMPERATURE AND, DURING SAID WATER WASHING STEP, BUBBLING A GAS INERT WITH RESPECT TO SAID SOLID POLYAMIDE THROUGH SAID WATER TO CONTACT SAID POLYAMIDE PARTICLES TO EFFECT THE REMOVAL OF SUBSTANTIALLY ALL OF SAID MONOMER AND SAID LOW MOLECULAR WEIGHT POLYAMIDE FROM SAID SOLIDE POLYAMIDE.
Claim 2
Independent Claim
81 words
A METHOD FOR THE PURIFICATION OF AN IMPURE SOLID, FILAMENT-FORMING LINEAR POLYAMIDE CONTAINING A POLYAMIDE-FORMING MONOMER AND LOW MOLECULAR WEIGHT POLYAMIDES AS IMPURITIES WHICH COMPRISES WASHING PARTICLES OF SAID SOLID POLYAMIDE WITH WATER AT AN ELEVATED TEMPERATURE AND, DURING SAID WATER WASHING STEP, BUBBLING A GAS INERT WITH RESPECT TO SAID SOLID POLYAMIDE THROUGH SAID WATER TO CONTACT SAID POLYAMIDE PARTICLES TO EFFECT THE REMOVAL OF SUBSTANTIALLY ALL OF SAID MONOMER AND SAID LOW MOLECULAR WEIGHT POLYAMIDE FROM SAID SOLIDE POLYAMIDE.
References Cited (Backward Citations)
US2867805A
Cited
US2887470A
Cited
US2923699A
Cited
US3015651A
Cited
US2978439A
Cited
US2987506A
Cited
US3047565A
Cited
FR1243538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |