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US3844820A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of applying a coating to both sides of a moving strip

Assignee: Bethlehem Steel Corp
•
Filing: 1972-08-09
•
Granted: 1974-10-29
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Expires: 1992-08-09
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Abstract

Abstract This invention relates to a method of simultaneously coating both sides of a moving strip with a solution, said strip having a pass line above the bath of said solution, comprising the steps of lifting a column of said solution out of said bath, said column being wider than said strip and higher than the pass line of said strip, passing said strip through said column of solution, and controlling the speed of said strip and the height and width of said column relative to the width of said strip and height of the strip pass line whereby both sides of said strip are coated simultaneously. The strip can be a galvanized strip treated with a chromate conversion coating or can be a tin plate treated with palm oil.

Inventors

  • 👤 R Shaffer
  • 👤 L Caldwell

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 21:34
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/26; B05B; B05B13/00; B05B13/02; B05B13/0207; B05B17/00; B05B17/04; B05B7/00; B05B7/02; B05B7/025; B05C; B05C9/00; B05C9/02

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 100 words
A METHOD OF SIMULTANEOUSLY COATING BOTH SIDES OF MOVING STRIP WITH SOLUTION, SAID STRIP HAVING A PASS LINE ABOVE A BATH OF SAID SOLUTION, COMPRISING: A. LIFTING A COLUMN OF SAID SOLUTION OUT OF SAID BATH, SAID COLUMN BEING WIDER THAN SAID STRIP AND HIGHER THAN THE PASS LINE OF SAID STRIP, B. PASSING SAID STRIP THROUGH SAID COLUMN OF SOLUTION, AND C. CONTROLLING THE SPEED OF SAID STRIP AND THE HEIGHT AND WIDTH OF SAID COLUMN RELATIVE TO THE WIDTH OF SAID STRIP AND HEIGHT OF THE STRIP PASS LINE WHEREBY BOTH SIDES OF SAID STRIP ARE COATED SIMULTANEOUSLY.
Claim 2
Independent Claim 100 words
A METHOD OF SIMULTANEOUSLY COATING BOTH SIDES OF MOVING STRIP WITH SOLUTION, SAID STRIP HAVING A PASS LINE ABOVE A BATH OF SAID SOLUTION, COMPRISING: A. LIFTING A COLUMN OF SAID SOLUTION OUT OF SAID BATH, SAID COLUMN BEING WIDER THAN SAID STRIP AND HIGHER THAN THE PASS LINE OF SAID STRIP, B. PASSING SAID STRIP THROUGH SAID COLUMN OF SOLUTION, AND C. CONTROLLING THE SPEED OF SAID STRIP AND THE HEIGHT AND WIDTH OF SAID COLUMN RELATIVE TO THE WIDTH OF SAID STRIP AND HEIGHT OF THE STRIP PASS LINE WHEREBY BOTH SIDES OF SAID STRIP ARE COATED SIMULTANEOUSLY.
Claim 3
Dependent Claim 23 words
A method as recited in claim 1, in which said column extends to about 1/2 to 2 1/2 inches above said pass line.
Claim 4
Dependent Claim 20 words
A method as recited in claim 2, in which said strip moves at a speed of 50 to 300 ft./min.
Claim 5
Dependent Claim 18 words
A method as recited in claim 1, in which said strip is characterized by a transverse downward concavity.

References Cited (Backward Citations)

US2945472A Cited
US3034923A Cited
US3141793A Cited
US3256855A Cited
US3203395A Cited
US3305459A Cited
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US3654896A Cited
US3367791A Cited
US3396699A Cited
US3565662A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-10-28 1978-04-29 1978-10-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-10-28 1982-04-29 1982-10-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-10-28 1986-04-29 1986-10-29 $7700.00 Window Closed / Lapsed

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