US3330809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized powder polymerization process for polyesters
Assignee: Eastman Kodak Co
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Filing: 1962-03-29
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Granted: 1967-07-11
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 John S Perlowski
- 👤 Robert D Coffee
- 👤 Robert B Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
AN IMPROVED PROCESS FOR RAPIDLY BUILDING UP THE MOLECULAR WEIGHT OF AN INTERMEDIATE MOLECULAR WEIGHT LINEAR POLYESTER IN THE FORM OF PREPOLYMER POWDER COMPRISING PASSING HOT INERT GAS THROUGH SAID POWDER SO AS TO ACHIEVE AND MAINTAIN A FLUIDIZED CONDITION, COLLECTING AND PURIFHYING THE EFFLUENT GAS, RECIRCULATING TO THE FLUIDIZED POLYMER POWDER SAID INERT GAS AFTER IT HAS BEEN PURIFIED AND CONTINUING THIS PROCESS UNTIL THE INTRINSIC VISCOSITY HAS BEEN SUBSTANTIALLY INCREASED, SAID PURIFYING BEING ACCOMPLISHED BY PASSING SAID GAS THROUGH A ZEOLITIC MOLECULAR SIEVE CAPABLE OF REMOVING MOLECULES HAVING CRITICAL DIAMETERS WITHIN THE RANGE OF FROM ABOUT 3 UP TO ABOUT 20 ANGSTROM UNITS WHEREBY SAID PURIFIED GAS IS OBTAINED.
Claim 2
Dependent Claim
111 words
AN IMPROVED PROCESS FOR RAPIDLY BUILDING UP THE MOLECULAR WEIGHT OF AN INTERMEDIATE MOLECULAR WEIGHT LINEAR POLYESTER IN THE FORM OF PREPOLYMER POWDER COMPRISING PASSING HOT INERT GAS THROUGH SAID POWDER SO AS TO ACHIEVE AND MAINTAIN A FLUIDIZED CONDITION, COLLECTING AND PURIFHYING THE EFFLUENT GAS, RECIRCULATING TO THE FLUIDIZED POLYMER POWDER SAID INERT GAS AFTER IT HAS BEEN PURIFIED AND CONTINUING THIS PROCESS UNTIL THE INTRINSIC VISCOSITY HAS BEEN SUBSTANTIALLY INCREASED, SAID PURIFYING BEING ACCOMPLISHED BY PASSING SAID GAS THROUGH A ZEOLITIC MOLECULAR SIEVE CAPABLE OF REMOVING MOLECULES HAVING CRITICAL DIAMETERS WITHIN THE RANGE OF FROM ABOUT 3 UP TO ABOUT 20 ANGSTROM UNITS WHEREBY SAID PURIFIED GAS IS OBTAINED.
References Cited (Backward Citations)
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US2973341A
Cited
US3031433A
Cited
US3192184A
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US3066116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |