Patent US3816938A successfully refreshed from Google Patents.
US3816938A
Expired / Lapsed
US
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Method and device for drying enamel slip on inner surfaces of pipes
Assignee: Individual
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Filing: 1972-03-22
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Granted: 1974-06-18
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Expires: 1992-03-22
Abstract
Abstract A method and device for drying enamel slip on the inner surface of pipes by induction heating wherein the vapours generated during drying of the slip are sucked out from inside the pipe.
Inventors
- 👤 E Nikolaevich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:05
CPC Classifications
F; F26; F26B; F26B21/00; F26B21/006; C; C23; C23D; C23D7/00; F26B3/00; F26B3/32; F26B3/34; F26B3/343
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A method of drying enamel slip on the inner surface of a pipe by the induction method which comprises disposing a pipe with a layer of enamel slip coated on the inner surface thereof inside an inductor so that said inductor embraces the pipe on the outside; inserting a hollow standpipe inside said pipe to evacuate said pipe of vapors generated on slip drying as a result of pipe heating; energizing said inductor to heat said pipe; moving said pipe progressively in the course of heating axially with relation to said inductor embracing it on the outside, and connecting said standpipe to suction means to remove vapors generated on slip drying in order to prevent formation of condensate on the inner surface of the unheated end of the pipe.
Claim 2
Independent Claim
129 words
A method of drying enamel slip on the inner surface of a pipe by the induction method which comprises disposing a pipe with a layer of enamel slip coated on the inner surface thereof inside an inductor so that said inductor embraces the pipe on the outside; inserting a hollow standpipe inside said pipe to evacuate said pipe of vapors generated on slip drying as a result of pipe heating; energizing said inductor to heat said pipe; moving said pipe progressively in the course of heating axially with relation to said inductor embracing it on the outside, and connecting said standpipe to suction means to remove vapors generated on slip drying in order to prevent formation of condensate on the inner surface of the unheated end of the pipe.
Claim 3
Independent Claim
84 words
A device for drying enamel slip on the inner surface of pipes by induction heating comprising: a heating inductor installed immovably around the pipe to be heated; a mechanism for moving the pipe during heating axially with relation to said inductor; a hollow standpipe one end of which is inserted into the pipe and located in the zone of said inductor while the other end protrudes from the pipe; and a suction device connected to the end of said standpipe protruding from the pipe.
Claim 4
Independent Claim
84 words
A device for drying enamel slip on the inner surface of pipes by induction heating comprising: a heating inductor installed immovably around the pipe to be heated; a mechanism for moving the pipe during heating axially with relation to said inductor; a hollow standpipe one end of which is inserted into the pipe and located in the zone of said inductor while the other end protrudes from the pipe; and a suction device connected to the end of said standpipe protruding from the pipe.
Claim 5
Dependent Claim
25 words
A device according to claim 2 wherein the end of the hollow standpipe located in the zone of said inductor has a multitude of holes.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |