US4070193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant metal sealing formulation
Assignee: Kaddis Mfg Co
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Filing: 1975-09-19
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Granted: 1978-01-24
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Expires: 1995-09-19
Abstract
Abstract A bright finish on a copper or copper alloy metal piece is sealed by dipping the piece in an aqueous solution of sodium bichromate, chromic acid and sulfuric acid followed by rinsing in cold and then hot water. The sealed piece is quite resistant to corrosion.
Inventors
- 👤 James Mackey Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:52
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
Aqueous solution for sealing a bright metal finish on copper and copper alloy metal articles consisting essentially of a mixture of about 1 to 3 pounds of sodium bichromate, about 1/4 to 1 ounce of chromic acid, about 1 to 25 milliliters of sulfuric acid for each 2 gallons of water.
Claim 2
Dependent Claim
51 words
Aqueous solution for sealing a bright metal finish on copper and copper alloy metal articles consisting essentially of a mixture of about 1 to 3 pounds of sodium bichromate, about 1/4 to 1 ounce of chromic acid, about 1 to 25 milliliters of sulfuric acid for each 2 gallons of water.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |