US3783236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically operated steam heater
Assignee: GTE Sylvania Inc
•
Filing: 1973-03-02
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Granted: 1974-01-01
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Expires: 1993-03-02
Abstract
Abstract An electrical heater for heating steam to a superheated temperature has a longitudinal heating element disposed within a glass or ceramic tube which, in turn, is disposed within a metal cylinder. The heating element is made of resistance wire and has a cyclical spiral shape for efficient heat transfer. Steam is introduced into one end of the metal cylinder, passes through the heater and exits from the other end as superheated steam.
Inventors
- 👤 R Edin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:35
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
235 words
An electrically operated steam heater comprising: an elongated metal cylinder open at both ends; a longitudinal cyclical spiral corrosion resistant wire wound heating element, having an axial bore therethrough, disposed in said cylinder, the individual turns of said heating element being substantially polygonal in shape; a ceramic tube positioned within and attached to said metal cylinder encircling said heating element and electrically insulating said heating element from said metal cylinder; a ceramic rod having an axial hole therethrough disposed within the bore of said heating element said ceramic rod being externally threaded and said heating element being threaded onto said ceramic rod; two electrical connecting means attached to said metal cylinder for connecting said heater to an external source of electrical power, the end of said heating element that is more distant from said electrical connecting means being connected to one of said electrical connecting means by a wire passing through the axial hole of said ceramic rod, the other end of said heating element being directly connected to the other electrical connecting means each of said electrical connecting means comprising a ceramic and metal feed through and a metal feed through insert; two means to longitudinally position said glass tube in said metal cylinder, said feed through inserts are one of the means for longitudinally positioning said glass tube in said metal cylinder; and means to connect said heater to a source of steam.
Claim 2
Dependent Claim
235 words
An electrically operated steam heater comprising: an elongated metal cylinder open at both ends; a longitudinal cyclical spiral corrosion resistant wire wound heating element, having an axial bore therethrough, disposed in said cylinder, the individual turns of said heating element being substantially polygonal in shape; a ceramic tube positioned within and attached to said metal cylinder encircling said heating element and electrically insulating said heating element from said metal cylinder; a ceramic rod having an axial hole therethrough disposed within the bore of said heating element said ceramic rod being externally threaded and said heating element being threaded onto said ceramic rod; two electrical connecting means attached to said metal cylinder for connecting said heater to an external source of electrical power, the end of said heating element that is more distant from said electrical connecting means being connected to one of said electrical connecting means by a wire passing through the axial hole of said ceramic rod, the other end of said heating element being directly connected to the other electrical connecting means each of said electrical connecting means comprising a ceramic and metal feed through and a metal feed through insert; two means to longitudinally position said glass tube in said metal cylinder, said feed through inserts are one of the means for longitudinally positioning said glass tube in said metal cylinder; and means to connect said heater to a source of steam.
Claim 3
Dependent Claim
28 words
The heater of claim 1 wherein another means for longitudinally positioning said glass tube in said metal cylinder is a tubular metal spacer welded to said metal cylinder.
Claim 4
Dependent Claim
33 words
The heater of claim 1 wherein said further end of said heating element and said wire passing through said ceramic rod both extend into a small metal coil where they are welded together.
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |