US3290790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drying a hydrogel
Assignee: Mizusawa Industrial Chemicals Ltd
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Filing: 1964-03-23
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Granted: 1966-12-13
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Expires: 1984-03-23
Abstract
No abstract record available.
Inventors
- 👤 Kunii Daizo
- 👤 Sugahara Yujiro
- 👤 Sato Kiyoshi
- 👤 Saito Masaji
- 👤 Ogawa Masahide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:06
CPC Classifications
F; F26; F26B; F26B23/00; F26B23/001; F26B23/002; F26B23/004; F26B17/00; F26B17/12; F26B17/16; F26B3/00; F26B3/18; F26B3/20; F26B3/205; Y; Y02; Y02B; Y02B30/00; Y02B30/52; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A METHOD OF DRYING HYDROGELS WHICH COMPRISES FEEDING A MIXTURE OF SAID HYDROGELS TOGETHER WITH FINELY DIVIDED POROUS GRANULES HAVING A PARTICLE SIZE OF 10 TO 200 TYLER''S MESH WHEREIN THE MIXTURE CONTAINS HYDROGELS OF A HIGHER AVERAGE APPARENT SPECIFIC GRAVITY AND A HIGHER AVERAGE DIAMETER THAN SAID POROUS GRANULES INTO A DRYING TOWER FROM ITS UPPER PART, AND HEATING SAID HYDROGELS AND SAID GRANULES FROM THE EXTERIOR OF SAID TOWER WHEREBY AQUEOUS VAPORS ARE EMITTED FROM THE HYDROGEL SURFACES AND ARE ABSORBED BY THE POROUS GRANULES, CONTINUING SAID HEATING WHEREBY THE AQUEOUS VAPORS ARE EMITTED FROM THE GRANULES TO THE AMBIENT ATMOSPHERE SO AS TO FLUIDIZE SAID FINELY DIVIDED POROUS GRANULES IN THE INTERSPACES AMONG SAID HYDROGELS BY THE ACTION OF SAID AQUEOUS VAPOR EVOLVED FROM SAID HYDROGELS WITHIN SAID TOWER, AND RECOVERING THE DRIED GELS TOGETHER WITH SAID GRANULES FROM THE LOWER PART OF SAID TOWER.
Claim 2
Independent Claim
148 words
A METHOD OF DRYING HYDROGELS WHICH COMPRISES FEEDING A MIXTURE OF SAID HYDROGELS TOGETHER WITH FINELY DIVIDED POROUS GRANULES HAVING A PARTICLE SIZE OF 10 TO 200 TYLER''S MESH WHEREIN THE MIXTURE CONTAINS HYDROGELS OF A HIGHER AVERAGE APPARENT SPECIFIC GRAVITY AND A HIGHER AVERAGE DIAMETER THAN SAID POROUS GRANULES INTO A DRYING TOWER FROM ITS UPPER PART, AND HEATING SAID HYDROGELS AND SAID GRANULES FROM THE EXTERIOR OF SAID TOWER WHEREBY AQUEOUS VAPORS ARE EMITTED FROM THE HYDROGEL SURFACES AND ARE ABSORBED BY THE POROUS GRANULES, CONTINUING SAID HEATING WHEREBY THE AQUEOUS VAPORS ARE EMITTED FROM THE GRANULES TO THE AMBIENT ATMOSPHERE SO AS TO FLUIDIZE SAID FINELY DIVIDED POROUS GRANULES IN THE INTERSPACES AMONG SAID HYDROGELS BY THE ACTION OF SAID AQUEOUS VAPOR EVOLVED FROM SAID HYDROGELS WITHIN SAID TOWER, AND RECOVERING THE DRIED GELS TOGETHER WITH SAID GRANULES FROM THE LOWER PART OF SAID TOWER.
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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |