Patent US3684262A successfully refreshed from Google Patents.
US3684262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass furnaces
Assignee: National Research Development Corp UK
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Filing: 1970-09-24
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Granted: 1972-08-15
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Expires: 1990-09-24
Abstract
Abstract A glass furnace having its side walls chamfered at the top within the range of more than 30* to 45* to the horizontal from their inner vertical face over a substantial portion of the width of the top of the walls, whereby the resultant chamfered surface includes the flux line when the furnace is in use.
Inventors
- 👤 Terence Stanley Busby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:38
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/42; C03B5/425
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A glass furnace having its side walls chamfered at the top within the range of more than 30* to 45* to the horizontal from their inner vertical face over a substantial portion of the width of the top walls, the resultant chamfered surface including the flux line when the furnace is in use.
Claim 2
Dependent Claim
53 words
A glass furnace having its side walls chamfered at the top within the range of more than 30* to 45* to the horizontal from their inner vertical face over a substantial portion of the width of the top walls, the resultant chamfered surface including the flux line when the furnace is in use.
Claim 3
Dependent Claim
28 words
A glass furnace as in claim 1, wherein the side walls are chamfered at the top within the range of more than 30* to 40* to the horizontal.
Claim 4
Dependent Claim
22 words
A glass furnace as in claim 1, wherein the side walls are chamfered at the top at substantially 35* to the horizontal.
Claim 5
Dependent Claim
25 words
A glass furnace as in claim 1, having a full-height block construction for its side walls, the chamfering being at the top of the block.
Claim 6
Dependent Claim
23 words
A glass furnace as in claim 1, having a coursed construction for its side walls, the chamfering being provided in the top course.
Claim 7
Dependent Claim
13 words
A glass furnace as in claim 1, wherein the chamfered surface is plane.
Claim 8
Dependent Claim
35 words
A glass furnace as in claim 1, wherein the chamfered surface is convex, the tangent at any point on the convex surface lying within the range of more than 30* to 45* to the horizontal.
Claim 9
Dependent Claim
35 words
A glass furnace as in claim 1, wherein the chamfered surface is concave, the tangent at any point on the concave surface lying within the range of more than 30* to 45* to the horizontal.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |