Patent US3751213A successfully refreshed from Google Patents.
US3751213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High intensity radiant gas burner
Assignee: EIDP Inc
•
Filing: 1971-11-19
•
Granted: 1973-08-07
•
Expires: 1991-11-19
Abstract
Abstract A radiant heat gas burner comprising a radiant element formed of a refractory ceramic honeycomb, and a porous gas injection block formed of refractory fibers can be operated at high turn-down ratios and at high temperatures. Still higher operating temperatures can be reached when the combustion chamber is either completely or partially filled by refractory fibers.
Inventors
- 👤 D Sowards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:40
CPC Classifications
F; F23; F23C; F23C99/00; F23C2700/00; F23C2700/04; F23C2700/043; F23D; F23D2203/00; F23D2203/10; F23D2203/104; F23D2203/105; F23D2203/1055; F23D2900/00; F23D2900/00003
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
23 words
The radiant heat gas burner of claim 1 wherein the gas injection system is constituted of the porous block formed from refractory fibers.
Claim 2
Dependent Claim
63 words
The radiant heat gas burner of claim 1 wherein the number of cells in the radiant heat element is comprised within the range of 2 2/3 to 15 per inch; the open cell area of said element normal to the cell axes is within the range of about 40 to 95 percent; and the length-to-diameter ratio of the cells is at least 2:1.
Claim 3
Dependent Claim
20 words
The radiant heat burner of claim 1 wherein the cells of the element are slanted to the honeycomb open surfaces.
Claim 4
Dependent Claim
27 words
The radiant heat burner of claim 1 wherein the cells of the radiant element are slanted in part and normal in part to the honeycomb open surfaces.
Claim 5
Dependent Claim
45 words
The radiant heat gas burner of claim 1, wherein the combustion chamber is filled to at least part of its height with a loose tow of refractory fibers, the packing density of the fibers being less than 1 lb./cu.ft. to 3 lb./cu.ft. of bulk material.
Claim 6
Dependent Claim
76 words
The radiant heat gas burner of claim 6 wherein the gas injection system is constituted of a planar refractory ceramic honeycomb structure in contact with the porous block formed from refractory fibers, so arranged that the surface of said porous block opposite to the surface defining a portion of the combustion zone is in contact with one end of each cell of the honeycomb structure, the cells of the honeycomb being normal to its open surfaces.
Claim 7
Dependent Claim
17 words
The radiant heat burner of claim 6 wherein the refractory fiber tow completely fills the combustion chamber.
Claim 8
Dependent Claim
19 words
The radiant heat burner of claim 6 wherein the refractory fiber tow in the combustion chamber is alumina fibers.
Claim 9
Dependent Claim
33 words
The radiant heat gas burner of claim 1 wherein the height of the combustion zone is one-sixteenth to 1 inch, and the cell diameter of the radiant element is one-sixteenth to one-fourth inch.
Claim 10
Dependent Claim
20 words
The radiant heat gas burner of claim 10 wherein the cell length-to-diameter ratio of the radiant element is about 8:1.
Claim 11
Dependent Claim
17 words
The radiant heat burner of claim 10 wherein the porous injection block is made of alumina fibers.
Claim 12
Dependent Claim
43 words
The radiant heat burner of claim 1 wherein the porosity of the porous gas injection block is such that the pressure drop of the gas and air mixture on passing from the gas distribution chamber into the combustion chamber is about 2-20 psig.
Claim 13
Dependent Claim
25 words
The radiant heat burner of claim 13 wherein the thickness of the ceramic honeycomb in the gas injection system is about one-eighth to one-half inch.
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) | 1976-08-06 | 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 |