US3809529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endless furnace
Assignee: Eisenmann Corp
•
Filing: 1972-10-26
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Granted: 1974-05-07
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Expires: 1992-10-26
Abstract
Abstract An endless porcelain enameling tunnel furnace having an inner and outer periphery, a plurality of ports positioned along said outer periphery in spaced relationship to each other to permit entry and removal of a work place to be placed in said furnace, an internal radiant heat means, and internal means for continuously advancing work pieces to be enameled.
Inventors
- 👤 H Gornall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:53
CPC Classifications
C; C23; C23D; C23D9/00; C23D9/02; F; F27; F27B; F27B9/00; F27B9/14; F27B9/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
101 words
A curvilinear porcelain enameling furnace having a pair of substantially concentric, curvilinear endless sidewalls bridged by a roof therebetween over their respective lengths, said walls and roof forming an endless, substantially enclosed curvilinear tunnel, three consecutive ports positioned along the outer sidewall in spaced relationship to each other to permit entry or removal of a work piece into or from said furnace, internal radiant heat means, means associated with said internal radiant heat means for maintaining said enclosed tunnel substantially free of products of combustion, and internal means for progressively and chronologically advancing work pieces in one direction through said tunnel.
Claim 2
Dependent Claim
101 words
A curvilinear porcelain enameling furnace having a pair of substantially concentric, curvilinear endless sidewalls bridged by a roof therebetween over their respective lengths, said walls and roof forming an endless, substantially enclosed curvilinear tunnel, three consecutive ports positioned along the outer sidewall in spaced relationship to each other to permit entry or removal of a work piece into or from said furnace, internal radiant heat means, means associated with said internal radiant heat means for maintaining said enclosed tunnel substantially free of products of combustion, and internal means for progressively and chronologically advancing work pieces in one direction through said tunnel.
Claim 3
Dependent Claim
56 words
The furnace of claim 1 wherein the ports comprise a first charging port to permit charging of a work piece, a second port to permit removal of a work piece to be dusted with powdered enamel and for recharging the powdered enameled work piece, and a third port for removing the resultant fired enamel work piece.
Claim 4
Dependent Claim
101 words
A curvilinear porcelain enameling furnace having a pair of substantially concentric, curvilinear endless sidewalls bridged by a roof therebetween over their respective lengths, said walls and roof forming an endless, substantially enclosed curvilinear tunnel, six consecutive ports positioned along the outer sidewall in spaced relationship to each other to permit entry or removal of a work piece into or from said furnace, internal radiant heat means, means associated with said internal radiant heat means for maintaining said enclosed tunnel substantially free of products of combustion, and internal means for progressively and chronologically advancing work pieces in one direction through said tunnel.
Claim 5
Dependent Claim
101 words
A curvilinear porcelain enameling furnace having a pair of substantially concentric, curvilinear endless sidewalls bridged by a roof therebetween over their respective lengths, said walls and roof forming an endless, substantially enclosed curvilinear tunnel, six consecutive ports positioned along the outer sidewall in spaced relationship to each other to permit entry or removal of a work piece into or from said furnace, internal radiant heat means, means associated with said internal radiant heat means for maintaining said enclosed tunnel substantially free of products of combustion, and internal means for progressively and chronologically advancing work pieces in one direction through said tunnel.
Claim 6
Dependent Claim
86 words
The furnace of claim 3 wherein the ports comprise a first charging port to permit charging of a work piece, a second port to permit removal of a work piece to be dusted with powdered enamel, a third port for recharging the powdered enameled work piece, a fourth port to permit removal of a work piece to be dusted with more powdered enamel, a fifth port for recharging the powdered enamel work piece, and a sixth port for removal of the resultant fired enameled work piece.
Claim 7
Dependent Claim
101 words
A curvilinear porcelain enameling furnace having a pair of substantially concentric, curvilinear endless sidewalls bridged by a roof therebetween over their respective lengths, said walls and roof forming an endless, substantially enclosed curvilinear tunnel, four consecutive ports positioned along the outer sidewall in spaced relationship to each other to permit entry or removal of a work piece into or from said furnace, internal radiant heat Means, means associated with said internal radiant heat means for maintaining said enclosed tunnel substantially free of products of combustion, and internal means for progressively and chronologically advancing work pieces in one direction through said tunnel.
Claim 8
Dependent Claim
101 words
A curvilinear porcelain enameling furnace having a pair of substantially concentric, curvilinear endless sidewalls bridged by a roof therebetween over their respective lengths, said walls and roof forming an endless, substantially enclosed curvilinear tunnel, four consecutive ports positioned along the outer sidewall in spaced relationship to each other to permit entry or removal of a work piece into or from said furnace, internal radiant heat Means, means associated with said internal radiant heat means for maintaining said enclosed tunnel substantially free of products of combustion, and internal means for progressively and chronologically advancing work pieces in one direction through said tunnel.
Claim 9
Dependent Claim
58 words
The furnace of claim 5 wherein the ports comprise a first charging port to permit charging of a work piece, a second port to permit removal of a work piece to be dusted with powdered enamel, a third port for recharging the powdered enameled work piece, and a fourth port for removing the resultant fired enameled work piece.
Claim 10
Dependent Claim
101 words
A curvilinear porcelain enameling furnace having a pair of substantially concentric, curvilinear endless sidewalls bridged by a roof therebetween over their respective lengths, said walls and roof forming an endless, substantially enclosed curvilinear tunnel, five consecutive ports positioned along the outer sidewall in spaced relationship to each other to permit entry or removal of a work piece into or from said furnace, internal radiant heat means, means associated with said internal radiant heat means for maintaining said enclosed tunnel substantially free of products of combustion, and internal means for progressively and chronologically advancing work pieces in one direction through said tunnel.
Claim 11
Dependent Claim
101 words
A curvilinear porcelain enameling furnace having a pair of substantially concentric, curvilinear endless sidewalls bridged by a roof therebetween over their respective lengths, said walls and roof forming an endless, substantially enclosed curvilinear tunnel, five consecutive ports positioned along the outer sidewall in spaced relationship to each other to permit entry or removal of a work piece into or from said furnace, internal radiant heat means, means associated with said internal radiant heat means for maintaining said enclosed tunnel substantially free of products of combustion, and internal means for progressively and chronologically advancing work pieces in one direction through said tunnel.
Claim 12
Dependent Claim
84 words
The furnace of claim 7 wherein the ports comprise a first charging port to permit charging of a work piece, a second port to permit removal of a work piece to be dusted with powdered enamel, a third port for recharging the powdered enameled work piece, a fourth port to permit removal of a work piece to be dusted with additional powdered enamel and for recharging the powdered enameled work piece, and a fifth port for removal of the resultant fired enameled work piece.
Claim 13
Dependent Claim
32 words
The furnace of claim 2 wherein said internal radiant heat means is for maintaining the interior of said furnace, in the vicinity of said second port, at peak dry process enameling temperatures.
Claim 14
Dependent Claim
32 words
The furnace of claim 6 wherein said internal radiant heat means is for maintaining the interior of said furnace, in the vicinity of said third port, at peak dry process enameling temperatures.
Claim 15
Dependent Claim
34 words
The furnace of claim 6 wherein said internal radiant heat means is for maintaining the interior of said furnace in the vicinity of said second and third ports at peak dry process enameling temperatures.
Claim 16
Dependent Claim
35 words
The furnace of claim 8 wherein said internal radiant heat means is for maintaining the interior of said furnace, in the vicinity of said second, third and fourth ports, at peak dry process enameling temperatures.
Claim 17
Dependent Claim
36 words
The furnace of claim 4 wherein said internal radiant heat means is for maintaining the interior of said furnace in the vicinity of said second, third, fourth and fifth ports at peak dry process enameling temperatures.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |