US3608520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating apparatus
Assignee: Bethlehem Steel Corp
•
Filing: 1969-09-12
•
Granted: 1971-09-28
•
Expires: 1989-09-12
Abstract
Abstract Molten zinc-coated material is wrap contacted with unequalsized, internally cooled, chromium-plated rolls prior to solidification to inhibit the formation of undesirable spangling of the zinc-coated surface.
Inventors
- 👤 Laurence B Caldwell
- 👤 Robert W Helman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/34; C23C2/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
Apparatus for producing minimized spangle-galvanized sheet and strip material according to claim 1 wherein said rolls are water cooled and provided with internal baffles for heat transfer and stiffness.
Claim 2
Dependent Claim
31 words
Apparatus for producing minimized spangle-galvanized sheet and strip material according to claim 2 wherein said cooled rolls have hard-wear and corrosion-resistant surfaces with a surface roughness of 40 to 80 grit.
Claim 3
Dependent Claim
32 words
Apparatus for producing minimized spangle-galvanized sheet and strip material according to claim 3 wherein said cooled rolls have surfaces formed from the group consisting of industrial chrome, tungsten or high-chrome stainless steel.
Claim 4
Dependent Claim
41 words
Apparatus for producing minimized spangle-galvanized sheet and strip material according to claim 3 additionally comprising: e. adjusting means to vary the lateral position of the rolls with respect to each other to vary the wrap of the strip about the rolls.
Claim 5
Dependent Claim
39 words
Apparatus for producing minimized spangle-galvanized material according to claim 4 wherein said cooled rolls are positioned approximately 75 percent to substantially 100 percent of the distance from the surface of the bath to thE freeze line on the strip.
References Cited (Backward Citations)
US1454376A
Cited
US1933401A
Cited
US2227976A
Cited
US2906018A
Cited
US2978355A
Cited
US2926103A
Cited
US3066041A
Cited
US3083120A
Cited
US3349749A
Cited
US3375805A
Cited
US3523036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |