US4256498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of refractory ware
Assignee: Bibrach and Rehberg
•
Filing: 1978-09-05
•
Granted: 1981-03-17
•
Expires: 1998-09-05
Abstract
Abstract Large size (over 150 kg) ware which has to be fired in a kiln to form refractory ware is surrounded by muffling or upright lattice work in order to maintain a substantially uniform temperature gradient around the ware during firing in the kiln and during part of the cooling-down phase. The kiln used is a tunnel kiln and other ware to be fired may form the muffling or lattice work.
Inventors
- 👤 Emil K. Kohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:46
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/32; F; F27; F27B; F27B9/00; F27B9/30; F27D; F27D5/00; F27B9/06; F27B9/08; F27B9/082; F27B9/088; F27D5/0062
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
In a process for burning ware of a size greater than 150 kg and having a wall thickness greater than 200 mm to form refractory products, the improvement which comprises processing the ware through a tunnel kiln and surrounding the ware with heat-resistant muffling or upright lattice work so as to maintain a substantially uniform temperature gradient around the ware.
Claim 2
Dependent Claim
60 words
In a process for burning ware of a size greater than 150 kg and having a wall thickness greater than 200 mm to form refractory products, the improvement which comprises processing the ware through a tunnel kiln and surrounding the ware with heat-resistant muffling or upright lattice work so as to maintain a substantially uniform temperature gradient around the ware.
Claim 3
Dependent Claim
22 words
A process according to claim 1, in which heat-resistant or upright lattice work is maintained around the ware during the cooling-down phase.
Claim 4
Dependent Claim
49 words
Process according to claims 1 or 2, in which the manner of placing the ware in the kiln, the temperature control in the zones of kiln firing and the linear speed of the ware through the kiln are adjusted to the indirect action of kiln firing on the ware.
Claim 5
Dependent Claim
26 words
A process according to claim 1, in which raw unfired mouldings, are used as the muffling or upright lattice work and thus become fired refractory bricks.
Claim 6
Dependent Claim
26 words
A process according to claim 4, in which to the firing temperature of the raw unfired mouldings is adapted to the large-size ware to be fired.
Claim 7
Dependent Claim
28 words
Process according to claim 5, in which the firing temperature of the raw unfired ware is about 50° C. higher than the firing temperature of the large-size ware.
Claim 8
Dependent Claim
11 words
Refractory ware when made according to the process of claim 1.
References Cited (Backward Citations)
US4102961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |