US3858329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for drying porous material
Assignee: Kanebo Ltd
•
Filing: 1973-03-16
•
Granted: 1975-01-07
•
Expires: 1993-03-16
Abstract
Abstract Porous material, for example, spongy polyvinyl acetal article, containing volatile liquid such as water is uniformly dried by charging the porous material into a closed drying chamber, blowing drying air, preferably, of a temperature higher than room temperature onto the porous material, and directing microwaves of very high or ultra high frequency onto the porous material without deterioration in quality.
Inventors
- 👤 Tohru Koide
- 👤 Takahiro Hattori
- 👤 Yoshio Ohno
- 👤 Mitsuru Maruya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:40
CPC Classifications
F; F26; F26B; F26B3/00; F26B3/32; F26B3/34; F26B3/343; B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5609
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A PROCESS FOR UNIFORMLY DRYING A POROUS MATERIAL CONSISTING ESENTIALLY OF POLYVINYL ACETAL, WHICH COMPRISES I. CHARGING A WATER CONTAINING POROUS MATERIAL CONSISTING ESSENTIALLY OF POLYVINYL ACETAL INTO A CLOSED DRYING CHAMBER; II. BLOWING DRYING AIR ONTO THE POROUS MATERIAL; AND III. DIRECTING ELECTROMAGNETIC MICROWAVES OF A VERY HIGH OR ULTRA HIGH FREQUENCY HAVING A DRYING CAPACITY NOT HIGHER THAN THAT OF THE DRYING AIR ONTO THE POROUS MATERIAL AT A STAGE AFTER THE BEGINNING STAGE OF BLOWING THE DRYING AIR.
Claim 2
Dependent Claim
81 words
A PROCESS FOR UNIFORMLY DRYING A POROUS MATERIAL CONSISTING ESENTIALLY OF POLYVINYL ACETAL, WHICH COMPRISES I. CHARGING A WATER CONTAINING POROUS MATERIAL CONSISTING ESSENTIALLY OF POLYVINYL ACETAL INTO A CLOSED DRYING CHAMBER; II. BLOWING DRYING AIR ONTO THE POROUS MATERIAL; AND III. DIRECTING ELECTROMAGNETIC MICROWAVES OF A VERY HIGH OR ULTRA HIGH FREQUENCY HAVING A DRYING CAPACITY NOT HIGHER THAN THAT OF THE DRYING AIR ONTO THE POROUS MATERIAL AT A STAGE AFTER THE BEGINNING STAGE OF BLOWING THE DRYING AIR.
Claim 3
Dependent Claim
81 words
A process for uniformly drying a porous material consisting essentially of polyvinyl acetal, which comprises i. charging a water containing porous material consisting essentially of polyvinyl acetal into a closed drying chamber; ii. blowing drying air onto the porous material; and iii. directing electromagnetic microwaves of a very high or ultra high frequency having a drying capacity not higher than that of the drying air onto the porous material at a stage after the beginning stage of blowing the drying air.
Claim 4
Dependent Claim
81 words
A process for uniformly drying a porous material consisting essentially of polyvinyl acetal, which comprises i. charging a water containing porous material consisting essentially of polyvinyl acetal into a closed drying chamber; ii. blowing drying air onto the porous material; and iii. directing electromagnetic microwaves of a very high or ultra high frequency having a drying capacity not higher than that of the drying air onto the porous material at a stage after the beginning stage of blowing the drying air.
Claim 5
Dependent Claim
20 words
A process as set forth in claim 1, wherein the drying air is of a temperature higher than room temperature.
Claim 6
Dependent Claim
18 words
A process as set forth in claim 1, wherein the temperature of drying air is higher than 40*C.
Claim 7
Dependent Claim
22 words
A process as set forth in claim 1, wherein the drying air is blown at a velocity of 0.5 to 5 m/sec.
Claim 8
Dependent Claim
21 words
A process as set forth in claim 1, wherein the microwaves have a very high frequency of 30 to 300 MHz.
Claim 9
Dependent Claim
21 words
A process as set forth in claim 1, wherein the microwaves have an ultra high frequency of 300 to 3,000 MHz.
Claim 10
Dependent Claim
19 words
A process as set forth in claim 1, wherein the porous material is in a dynamic state during drying.
References Cited (Backward Citations)
US3434220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |