Patent US3720003A successfully refreshed from Google Patents.
US3720003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the drying of green ceramic and other materials
Assignee: Keller Ofenbau GmbH
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Filing: 1971-02-10
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Granted: 1973-03-13
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Expires: 1991-02-10
Abstract
Abstract Apparatus for drying green ceramic articles such as high-voltage insulators, includes a drying chamber and an adjacent chamber in which drying air is pre-treated to give a required temperature and humidity. Once the latter has been achieved valves are opened, initially to a small extent, to admit the pre-treated air to the drying chamber.
Inventors
- 👤 E Huthmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:42
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/28; C04B33/30; F; F26; F26B; F26B21/00; F26B21/20; F26B21/202; F26B21/208; F26B21/30; F26B9/00; F26B9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
Apparatus for drying materials comprising means defining a drying space for the reception of the material, means defining an air pre-treatment space separate from the drying space and including passageways for circulating air selectively only within the pre-treatment space, control valve means controlling communication between the pretreatment space and the drying space, heater means within the pre-treatment space, humidifying means within the pre-treatment space, two fans disposed in the pre-treatment space, for circulating air through the said passageways and within the pre-treatment space whereby the temperature and humidity can be brought to the required values by the heater means and the humidifying means prior to communication being established by the control means between the pre-treatment space and the drying space, ducts for removing excess wet air and for admitting fresh air respectively to the pre-treatment space, and valves controlling flow through said ducts, said ducts being disposed laterally of the fans and serving to define said passageways in conjunction with the means defining the air pre-treatment space.
Claim 2
Dependent Claim
167 words
Apparatus for drying materials comprising means defining a drying space for the reception of the material, means defining an air pre-treatment space separate from the drying space and including passageways for circulating air selectively only within the pre-treatment space, control valve means controlling communication between the pretreatment space and the drying space, heater means within the pre-treatment space, humidifying means within the pre-treatment space, two fans disposed in the pre-treatment space, for circulating air through the said passageways and within the pre-treatment space whereby the temperature and humidity can be brought to the required values by the heater means and the humidifying means prior to communication being established by the control means between the pre-treatment space and the drying space, ducts for removing excess wet air and for admitting fresh air respectively to the pre-treatment space, and valves controlling flow through said ducts, said ducts being disposed laterally of the fans and serving to define said passageways in conjunction with the means defining the air pre-treatment space.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |