Patent US2844489A successfully refreshed from Google Patents.
US2844489A
Expired / Lapsed
US
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Fluidized bed coating process
Assignee: Knapsack AG
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Filing: 1957-12-20
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Granted: 1958-07-22
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Expires: 1977-12-20
Abstract
No abstract record available.
Inventors
- 👤 Gemmer Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:00
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/18; B05D1/22; B05D1/24; H; H02; H02K; H02K15/00; H02K15/12; Y; Y10; Y10S; Y10S264/00; Y10S264/51; Y10S425/00; Y10S425/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE PROCESS OF FORMING A LAYER OF MATERIAL ON A SURFACE OF AN ARTICLE WHICH COMPRISES FORMING A FLUIDIZED BED CONSISTING OF A DENSE PHASE BONDED BY AN UPPER FREE SURFACE BY PASSING A DISTRIBUTED ASCENDING CURRENT OF GAS AT A PREDETERMINED PRESSURE THROUGH A MASS OF SOLID. PULVERULENT, LAYER-FORMING MATERIAL CONTAINING PARTICLES THEREIN WHICH SINTER WHEN HEATED, IMMERSING THE ARTICLE SURFACE IN SAID DENSE PHASE WHILE SAID ARTICLE IS HEATED TO A TEMPERATURE BELOW THE DETERIORATION TEMPERATURE OF THE ARTICLE BUT AT LEAST AS HIGH AS THE SINTERING TEMPERATURE OF SAID PARTICLES, MOVING SAID ARTICLE SURFACE TO AND FRO WHILE IT IS IMMERSED THEREBY TO PRODUCE A UNIFORM LAYER OF SAID MATERIAL ON SAID SURFACE, AND COOLING THE ARTICLE.
Claim 2
Dependent Claim
120 words
THE PROCESS OF FORMING A LAYER OF MATERIAL ON A SURFACE OF AN ARTICLE WHICH COMPRISES FORMING A FLUIDIZED BED CONSISTING OF A DENSE PHASE BONDED BY AN UPPER FREE SURFACE BY PASSING A DISTRIBUTED ASCENDING CURRENT OF GAS AT A PREDETERMINED PRESSURE THROUGH A MASS OF SOLID. PULVERULENT, LAYER-FORMING MATERIAL CONTAINING PARTICLES THEREIN WHICH SINTER WHEN HEATED, IMMERSING THE ARTICLE SURFACE IN SAID DENSE PHASE WHILE SAID ARTICLE IS HEATED TO A TEMPERATURE BELOW THE DETERIORATION TEMPERATURE OF THE ARTICLE BUT AT LEAST AS HIGH AS THE SINTERING TEMPERATURE OF SAID PARTICLES, MOVING SAID ARTICLE SURFACE TO AND FRO WHILE IT IS IMMERSED THEREBY TO PRODUCE A UNIFORM LAYER OF SAID MATERIAL ON SAID SURFACE, AND COOLING THE ARTICLE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |