Patent US3031433A successfully refreshed from Google Patents.
US3031433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid phase polymerization of polyamides
Assignee: EIDP Inc
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Filing: 1958-04-18
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Granted: 1962-04-24
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Expires: 1978-04-18
Abstract
No abstract record available.
Inventors
- 👤 Jr George Clarke Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:25
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/04; C08G69/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE POLYMERIZATION PROCESS OF PRODUCING A POLYCARNONAMIDE POLYMER HAVING A MOLECULAR WEIGHT OF GREATER THAN ABOUT 15,000 FROM POLYCARBONAMIDE POLYMER HAVING A MOLECULAR WEIGHT GREATER THAN 1000 BUT LESS THAN ABOUT 15,000, WHICH COMPRISES: CONTINUOUSLY INTRODUCING AT A FIRST POINT SAID POLYCARBONAMIDE POLYMER HAVING A MOLECULAR WEIGHT OF GREATER THAN ABOUT 1000 BUT LESS THAN ABOUT 15,000 IN THE FORM OF PARTICLES HAVING A DIAMETER OF UP TO ABOUT 10 MM. INTO A STREAM OF OXYGEN FREE GAS HEATED TO A TEMPERATURE AT LEAST ABOUT 40*C. BELOW THE MELTING POINT OF SAID POLYCARBONAMIDE; AGITATING SAID STREAM CONTAINING SAID PARTICLES AT A PLURALITY OF PREDETERMINED ZONES, SAID ZONES SPACED SUFFICIENTLY FAR APART THAT RELATIVELY QUIESCENT REGIONS EXIST BETWEEN THE PREDETERMINED ZONES, THE VELOCITY OF THE OXYGEN-FREE GAS STREAM AND THE QUANTITY OF AGITATION BEING SO SELECTED THAT THE PARTICLES FORM A FLUIDIZED BED; CONTINUOUSLY WITH-
Claim 2
Dependent Claim
144 words
THE POLYMERIZATION PROCESS OF PRODUCING A POLYCARNONAMIDE POLYMER HAVING A MOLECULAR WEIGHT OF GREATER THAN ABOUT 15,000 FROM POLYCARBONAMIDE POLYMER HAVING A MOLECULAR WEIGHT GREATER THAN 1000 BUT LESS THAN ABOUT 15,000, WHICH COMPRISES: CONTINUOUSLY INTRODUCING AT A FIRST POINT SAID POLYCARBONAMIDE POLYMER HAVING A MOLECULAR WEIGHT OF GREATER THAN ABOUT 1000 BUT LESS THAN ABOUT 15,000 IN THE FORM OF PARTICLES HAVING A DIAMETER OF UP TO ABOUT 10 MM. INTO A STREAM OF OXYGEN FREE GAS HEATED TO A TEMPERATURE AT LEAST ABOUT 40*C. BELOW THE MELTING POINT OF SAID POLYCARBONAMIDE; AGITATING SAID STREAM CONTAINING SAID PARTICLES AT A PLURALITY OF PREDETERMINED ZONES, SAID ZONES SPACED SUFFICIENTLY FAR APART THAT RELATIVELY QUIESCENT REGIONS EXIST BETWEEN THE PREDETERMINED ZONES, THE VELOCITY OF THE OXYGEN-FREE GAS STREAM AND THE QUANTITY OF AGITATION BEING SO SELECTED THAT THE PARTICLES FORM A FLUIDIZED BED; CONTINUOUSLY WITH-
References Cited (Backward Citations)
US2783187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |