US3554168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace apparatus
Assignee: Stone and Webster Engineering Corp
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Filing: 1968-10-17
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Granted: 1971-01-12
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Expires: 1988-10-17
Abstract
Abstract A self-supporting conduit comprised of a plurality of horizontal tubes connected by tube bends. The self-supporting conduit is provided with support members which are integrally formed with each horizontal tube and arranged in vertical alignment to provide a continuous tube support from the base of the furnace to the top tube. The individual support members associated with each tube frictionally engage the support members associated with the horizontally adjacent tubes and thereby facilitate sliding therebetween to compensate for expansion. Vertical columns arranged on either side of the composite coil are provided to stabilize the coil.
Inventors
- 👤 Herman N Woebcke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:53
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/007; F28F9/013; C; C10; C10G; C10G9/00; C10G9/14; C10G9/18; C10G9/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
In a furnace for cracking hydrocarbons to produce olefins having a plurality of horizontally disposed thin walled furnace tubes arranged in vertical alignment, the improvement comprising substantially vertically aligned short tubular support sections each having inside surface dimensions substantially the same as the inside surface dimensions of the furnace tubes and outer surface dimensions greater than the outer surface dimension of the furnace tubes, which tubular support sections are welded to the furnace tubes to form a portion of each furnace tube wherein the lower portion of the outer surface of the tubular support sections rest on the upper portion of the support surface below to form a support structure; a longitudinally extending recess in the upper surface of each tubular support section configured to conform to the contour of the lower surface of the tubular support section directly above; a plate arranged in the floor of the furnace directly below each of the tubular support sections in the lowermost furnace tube; and vertical columns arranged adjacent to each side of the horizontally disposed tubes.
Claim 2
Dependent Claim
175 words
In a furnace for cracking hydrocarbons to produce olefins having a plurality of horizontally disposed thin walled furnace tubes arranged in vertical alignment, the improvement comprising substantially vertically aligned short tubular support sections each having inside surface dimensions substantially the same as the inside surface dimensions of the furnace tubes and outer surface dimensions greater than the outer surface dimension of the furnace tubes, which tubular support sections are welded to the furnace tubes to form a portion of each furnace tube wherein the lower portion of the outer surface of the tubular support sections rest on the upper portion of the support surface below to form a support structure; a longitudinally extending recess in the upper surface of each tubular support section configured to conform to the contour of the lower surface of the tubular support section directly above; a plate arranged in the floor of the furnace directly below each of the tubular support sections in the lowermost furnace tube; and vertical columns arranged adjacent to each side of the horizontally disposed tubes.
References Cited (Backward Citations)
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |