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US3307271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying polymers
Assignee: EIDP Inc
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Filing: 1964-02-06
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Granted: 1967-03-07
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Expires: 1984-02-06
Abstract
No abstract record available.
Inventors
- 👤 Simpson Donald Lanny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:46
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/46; C08J; C08J3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A SINGLE-STAGE PROCESS FOR DRYING POLYMER PARTICLES COMPRISING CIRCULATING A GASEOUS DRYING MEDIUM IN COUNTERCURRENT FLOW WITH POLYMER PARTICLES BEARING VAPORIZABLE LIQUID AND KEEPING THE VAPOR CONTENT OF SAID DRYING MEDIUM LOWERED BY RECIRCULATION OF A PORTION OF SAID DRYING MEDIUM THROUGH A VOLUME OF SAID VAPORIZABLE LIQUID.
Claim 2
Dependent Claim
48 words
A SINGLE-STAGE PROCESS FOR DRYING POLYMER PARTICLES COMPRISING CIRCULATING A GASEOUS DRYING MEDIUM IN COUNTERCURRENT FLOW WITH POLYMER PARTICLES BEARING VAPORIZABLE LIQUID AND KEEPING THE VAPOR CONTENT OF SAID DRYING MEDIUM LOWERED BY RECIRCULATION OF A PORTION OF SAID DRYING MEDIUM THROUGH A VOLUME OF SAID VAPORIZABLE LIQUID.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |