Formation of chromium-containing coatings on both sides of steel strip with one coated side having a bright finish

Assignee: Bethlehem Steel Corp

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Filing: 1968-11-18

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Granted: 1971-11-30

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Expires: 1988-11-18

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Abstract

Abstract IN A METHOD OF FORMING A CHROMIUM-CONTAINING COATING ON STEEL STRIP, A CHROMIUM-CONTAINING POWDER IS APPLIED UNIFORMLY TO ONE SIDE OF THE STRIP AND COMPACTED THEREON. THE THUS-PREPARED STRIP IS COILED AND DIFFUSION TREATED IN A PROTECTIVE ATMOSPHERE, PREFERABLY OF HYDROGEN, AND INCLUDING A HALOGEN-CONTAINING GAS AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO FORM A STAINLESS STEEL COATING ON BOTH SIDES OF THE STRIP

Inventors

👤 Julius V D Forstmann
👤 Richard M Willison

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-10-24 14:40

CPC Classifications

C; C23; C23C; C23C10/00; C23C10/28; C23C10/30; C23C10/32; C21; C21D; C21D1/00; C21D1/68; C21D1/70; C23C10/34; C23C10/36; C23C10/38; C23C10/40; C23C10/42; C23C26/00; C23C30/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/12993

Claims Analysis

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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)	1974-11-29	1975-05-31	1975-11-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-11-29	1979-05-31	1979-11-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-11-29	1983-05-31	1983-11-30	$7700.00	Window Closed / Lapsed

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