US3741834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal tarnish removers
Assignee: Phillips Petroleum Co
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Filing: 1971-10-27
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Granted: 1973-06-26
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Expires: 1991-10-27
Abstract
Abstract A COMPOSITION AND METHOD SUITABLE FOR REMOVAL OF TARNISH FROM METAL SURFACES, SUCH AS COPPER, SILVER, TIN, LEAD, ZINC, CADMIUM, AND ALLOYS THEREOF. THE COMPOSITION COMPRISES ONE OR MORE MERCAPTOAMIDES OR MERCAPTOIMIDES, OPTIONALLY INCLUDING AN ABRASIVE AND-OR DILUENT.
Inventors
- 👤 R Williams
- 👤 R Louthan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:37
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/34; C23; C23G; C23G1/00; C23G1/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |