US3751199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure kiln seal
Assignee: Huntington Alloys Corp
•
Filing: 1972-05-31
•
Granted: 1973-08-07
•
Expires: 1992-05-31
Abstract
Abstract A rotary kiln having a metal-to-metal seal between its rotary and stationary parts is provided with means for preventing the outward passage of dust-laden gas from the kiln into the gap between the mating surfaces of the seal.
Inventors
- 👤 L Toft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:48
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/22; F27B7/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
A rotary kiln having a metal-to-metal seal between the rotary structure and a stationary end structure in which the seal is enclosed in a chamber having moving and stationary walls between which there is an annular gap leading to the interior of the kiln, and means are provided for delivering a stream of gas into the chamber to pass from it into the kiln through the gap, thereby preventing the outward passage of dust-laden gas.
Claim 2
Dependent Claim
75 words
A rotary kiln having a metal-to-metal seal between the rotary structure and a stationary end structure in which the seal is enclosed in a chamber having moving and stationary walls between which there is an annular gap leading to the interior of the kiln, and means are provided for delivering a stream of gas into the chamber to pass from it into the kiln through the gap, thereby preventing the outward passage of dust-laden gas.
Claim 3
Dependent Claim
48 words
A rotary kiln according to claim 1 in which the chamber is bounded by a circular end plate, a circular inner plate carried by the end plate, The seal and a ring carried by the inner plate, the annular gap lying between the ring and the inner plate.
References Cited (Backward Citations)
US1998492A
Cited
US3043019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |