US2974091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing eye holing in lacquered tin-plate
Assignee: United States Steel Corp
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Filing: 1958-12-11
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Granted: 1961-03-07
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Expires: 1978-12-11
Abstract
No abstract record available.
Inventors
- 👤 Richard A Neish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:44
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C25; C25D; C25D11/00; C25D11/38; C25D5/00; C25D5/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD OF MAKING TIN PLATE WHICH CONSISTS IN ELECTRODEPOSITING A COATING OF TIN ON A SHEET-STEEL BASE, FORMING A PROTECTIVE FLIM CONTANINIG CHROMIUM COMPOUNDS AND AT LEAST A RESIDUAL AMOUNT OF FREE HEXAVALENT CHROMIUM OVER THE TIN COATING AND THEN TREATING THE TIN PLATE WITH AN AQUEOUS SOLUTION CONTAINING FROM .2 TO 1% OF A REDUCING AGENT EFFECTIVE TO REDUCE ANY FREE HEXAVALENT CHROMIUM THEREON TO TRIVALENT CHROMIUM.
Claim 2
Independent Claim
69 words
A METHOD OF MAKING TIN PLATE WHICH CONSISTS IN ELECTRODEPOSITING A COATING OF TIN ON A SHEET-STEEL BASE, FORMING A PROTECTIVE FLIM CONTANINIG CHROMIUM COMPOUNDS AND AT LEAST A RESIDUAL AMOUNT OF FREE HEXAVALENT CHROMIUM OVER THE TIN COATING AND THEN TREATING THE TIN PLATE WITH AN AQUEOUS SOLUTION CONTAINING FROM .2 TO 1% OF A REDUCING AGENT EFFECTIVE TO REDUCE ANY FREE HEXAVALENT CHROMIUM THEREON TO TRIVALENT CHROMIUM.
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) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |