US2820747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating tin surfaces
Assignee: Chicago Metallic Manuf Co
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Filing: 1952-01-04
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Granted: 1958-01-21
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Expires: 1972-01-04
Abstract
No abstract record available.
Inventors
- 👤 Robert I Fredrickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:54
CPC Classifications
C; C25; C25D; C25D11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN THE METHOD FOR TREATING TIN TO DEVELOP PERMANENT HEAT-ABSORBING, NON-REFLECTING SURFACE, THE STEPS OF ELECTROCHEMICALLY TREATING THE TIN SURFACE WHILE BEING SUBMERGED AS THE ANODE IN AN AQUEOUS ELECTROLYTIC BATH CONTAINING 1-5 OUNCES PER GALLON OF WATER SOLUBLE ALKALI METAL HYDROXIDE AND 0.5-5 OUNCES PER GALLON OF A WATER SOLUBLE CHROMATE AND THEN BAKING THE ELECTROCHEMICALLY TREATED TIN AT A TEMPERATURE ABOVE 300*F. UNTIL A UNIFORM DRAB DISCOLORATION IS FORMED OVER THE TREATED SURFACE.
Claim 2
Dependent Claim
75 words
IN THE METHOD FOR TREATING TIN TO DEVELOP PERMANENT HEAT-ABSORBING, NON-REFLECTING SURFACE, THE STEPS OF ELECTROCHEMICALLY TREATING THE TIN SURFACE WHILE BEING SUBMERGED AS THE ANODE IN AN AQUEOUS ELECTROLYTIC BATH CONTAINING 1-5 OUNCES PER GALLON OF WATER SOLUBLE ALKALI METAL HYDROXIDE AND 0.5-5 OUNCES PER GALLON OF A WATER SOLUBLE CHROMATE AND THEN BAKING THE ELECTROCHEMICALLY TREATED TIN AT A TEMPERATURE ABOVE 300*F. UNTIL A UNIFORM DRAB DISCOLORATION IS FORMED OVER THE TREATED SURFACE.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |