US4807559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for alloying of coatings
Assignee: National Steel Corp
•
Filing: 1987-09-02
•
Granted: 1989-02-28
•
Expires: 2007-09-02
Abstract
Abstract A method and apparatus particularly adapted for alloying a coating on a steel strip. The invention uses an induction heating furnace to produce a galvannealed product. In particular, the operating frequency to the heating coils of the furnace is modulated to avoid a resonant vibration in the steel strip through the heating zone of the furnace. Preferably the invention comprises imposing a frequency modulation on the operating frequency of the power signal to the heating coils.
Inventors
- 👤 Richard A. Sommer
- 👤 George Havas
- 👤 Mario Tama
- 👤 Clayton H. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:04
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/26; C23C2/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
An assembly for galvannealing steel strip comprising: means for applying a coating to the steel strip; means for controlling a thickness of the applied coating; means for heating the steel and coating by magnetic induction to produce a galvannealed product, the heating means having a preselected operating frequency; and circuit means for imposing a frequency modulation on the operating frequency whereby undesirable transverse flexural resonance in the galvannealed product is avoided.
Claim 2
Dependent Claim
71 words
An assembly for galvannealing steel strip comprising: means for applying a coating to the steel strip; means for controlling a thickness of the applied coating; means for heating the steel and coating by magnetic induction to produce a galvannealed product, the heating means having a preselected operating frequency; and circuit means for imposing a frequency modulation on the operating frequency whereby undesirable transverse flexural resonance in the galvannealed product is avoided.
Claim 3
Dependent Claim
22 words
The assembly as claimed in claim 1 wherein the means for imposing the frequency modulation comprises an oscillating circuit including variable components.
Claim 4
Dependent Claim
14 words
The assembly as claimed in claim 2 wherein the components comprise a variable inductor.
Claim 5
Dependent Claim
14 words
The assembly as claimed in claim 2 wherein the components comprise a variable capacitor.
Claim 6
Dependent Claim
19 words
The assembly as claimed in claim 1 wherein the means for varying comprises modulating a power supply operating frequency.
Claim 7
Dependent Claim
27 words
The assembly as claimed in claim 1 wherein the means for varying the operating frequency comprises circuit means for imposing a phase modulation on the operating frequency.
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) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |