US2931759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solderability of tin plate
Assignee: Inland Steel Co
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Filing: 1958-08-20
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Granted: 1960-04-05
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Expires: 1978-08-20
Abstract
No abstract record available.
Inventors
- 👤 Uno T Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:45
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN THE PRODUCTION OF TIN PLATE BY ELECTROLYTICALLY DEPOSITING TIN ON A BASE METAL SHEET, APPLYING TO A TIN COATED SURFACE OF THE SHEET AN AQUEOUS SOLUTION ADAPTED TO INHIBIT SUBSEQUENT FLOW BRIGHTENING OF THE SHEET AND CONTAINING A WATER SOLUBLE SILICATE, AND THEREAFTER HEATING THE SHEET TO AN ELEVATED TEMPERATURE FOR FUSING THE ELECTRODEPOSITED TIN AND THEREBY FLOW BRIGHTENING THE SHEET, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID SURFACE OF THE SHEET FOLLOWING THE FUSION STEP WITH A DILUTE AQUEOUS SOLUTION OF HYDROFLUORIC ACID WHEREBY TO REMOVE RESIDUAL SILICATE FROM THE SHEET AND THEREBY IMPROVE THE SOLDERABILITY OF THE TIN PLATE, SAID HYDROFLUORIC ACID SOLUTION BEING SUFFICIENTLY DILUTE AND THE CONTACT TIME WITH THE SHEET BEING SUFFICIENTLY BRIEF TO AVOID ANY ADVERSE EFFECT ON BRIGHTNESS AND ANY SUBSTANTIAL LOSS OF TIN.
Claim 2
Dependent Claim
131 words
IN THE PRODUCTION OF TIN PLATE BY ELECTROLYTICALLY DEPOSITING TIN ON A BASE METAL SHEET, APPLYING TO A TIN COATED SURFACE OF THE SHEET AN AQUEOUS SOLUTION ADAPTED TO INHIBIT SUBSEQUENT FLOW BRIGHTENING OF THE SHEET AND CONTAINING A WATER SOLUBLE SILICATE, AND THEREAFTER HEATING THE SHEET TO AN ELEVATED TEMPERATURE FOR FUSING THE ELECTRODEPOSITED TIN AND THEREBY FLOW BRIGHTENING THE SHEET, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID SURFACE OF THE SHEET FOLLOWING THE FUSION STEP WITH A DILUTE AQUEOUS SOLUTION OF HYDROFLUORIC ACID WHEREBY TO REMOVE RESIDUAL SILICATE FROM THE SHEET AND THEREBY IMPROVE THE SOLDERABILITY OF THE TIN PLATE, SAID HYDROFLUORIC ACID SOLUTION BEING SUFFICIENTLY DILUTE AND THE CONTACT TIME WITH THE SHEET BEING SUFFICIENTLY BRIEF TO AVOID ANY ADVERSE EFFECT ON BRIGHTNESS AND ANY SUBSTANTIAL LOSS OF TIN.
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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |