Patent US3556498A successfully refreshed from Google Patents.
US3556498A
Expired / Lapsed
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Heat treating retort with helix
Assignee: Duraloy Co
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Filing: 1969-01-08
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Granted: 1971-01-19
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Expires: 1989-01-08
Abstract
Abstract A retort for use in heating metal articles having an internal helix for moving articles in the retort while they are being heated.
Inventors
- 👤 John F Sheahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:33
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0031
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A rotary retort for heating solid articles comprising a cylindrical metal tube open at one end to receive articles to be heated, having an outlet near the other end for discharge of heated articles and having an inlet at said other end for admission of gas to treat articles in the tube, a helical coil mechanically fixed in position in the tube, said coil including a plurality of turns of substantial radial length and spaced apart longitudinally of the tube, and tumblers of substantial radial length extending inwardly from adjacent to the inner surface of the tube.
Claim 2
Dependent Claim
97 words
A rotary retort for heating solid articles comprising a cylindrical metal tube open at one end to receive articles to be heated, having an outlet near the other end for discharge of heated articles and having an inlet at said other end for admission of gas to treat articles in the tube, a helical coil mechanically fixed in position in the tube, said coil including a plurality of turns of substantial radial length and spaced apart longitudinally of the tube, and tumblers of substantial radial length extending inwardly from adjacent to the inner surface of the tube.
Claim 3
Dependent Claim
17 words
The retort set forth in claim 1 in which the tumblers are aligned lengthwise of the tube.
Claim 4
Dependent Claim
24 words
The retort set forth in claim 1 in which the tumblers are connected to opposed side surfaces of adjacent turns of the helical coil.
Claim 5
Dependent Claim
20 words
The retort set forth in claim 1 in which the tumblers are connected to the inner surface of the tube.
Claim 6
Dependent Claim
27 words
The retort set forth in claim 4 in which the outer edges of the turns of the helical coil are provided with notches to receive the tumblers.
Claim 7
Dependent Claim
35 words
The retort set forth in claim 1 in which the tube has a machined inner surface and the helical coil is mechanically fixed in said tube against said inner surface by contraction of the tube.
Claim 8
Dependent Claim
27 words
The retort set forth in claim 1 in which tumblers are attached to the tube and the coil is attached to at least one of the tumblers.
References Cited (Backward Citations)
US861235A
Cited
US3441259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |