Patent US3208512A successfully refreshed from Google Patents.
US3208512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger for rotary kiln and the like
Assignee: Dravo Corp
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Filing: 1963-07-24
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Granted: 1965-09-28
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Expires: 1983-07-24
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Kalmbach
- 👤 Donald R Rathburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:22
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/14; Y; Y10; Y10S; Y10S165/00; Y10S165/135; Y10S165/139; Y10S165/14; Y10S165/143
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A ROTARY KILN AND HEAT EXCHANGER APPARATUS COMPRISING A ROTARY CYLINDER WITHIN WHICH MATERIAL IS TREATED BY HEAT OF GASES THEREIN, A CHAMBER FIXED TO THE CYLINDER AND ROTATABLE THEREWITH, MEANS FOR PASSING HEAT TREATED MATERIAL FROM THE CYLINDER TO AND THROUGH THE CHAMBER, MEANS FOR PASSING HOT GASES FROM THE CYLINDER TO AND THROUGH THE CHAMBER, MEANS FOR INTRODUCING RAW MATERIAL INTO AND THROUGH THE CHAMBER, THE LATTER MEANS BEING SEALED FROM THE MEANS FOR PASSING HOT GAS AND THE MEANS FOR PASSING HEAT TREATED MATERIAL THROUGH THE CHAMBER, AND MEANS FOR CONVEYING RAW MATERIAL DISCHARGED FROM THE CHAMBER TO THE CYLINDER FOR PROCESSING.
Claim 2
Dependent Claim
105 words
A ROTARY KILN AND HEAT EXCHANGER APPARATUS COMPRISING A ROTARY CYLINDER WITHIN WHICH MATERIAL IS TREATED BY HEAT OF GASES THEREIN, A CHAMBER FIXED TO THE CYLINDER AND ROTATABLE THEREWITH, MEANS FOR PASSING HEAT TREATED MATERIAL FROM THE CYLINDER TO AND THROUGH THE CHAMBER, MEANS FOR PASSING HOT GASES FROM THE CYLINDER TO AND THROUGH THE CHAMBER, MEANS FOR INTRODUCING RAW MATERIAL INTO AND THROUGH THE CHAMBER, THE LATTER MEANS BEING SEALED FROM THE MEANS FOR PASSING HOT GAS AND THE MEANS FOR PASSING HEAT TREATED MATERIAL THROUGH THE CHAMBER, AND MEANS FOR CONVEYING RAW MATERIAL DISCHARGED FROM THE CHAMBER TO THE CYLINDER FOR PROCESSING.
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |