Patent US2903431A successfully refreshed from Google Patents.
US2903431A
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US
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Nontarnishing detergent compositions containing stannous salts
Assignee: Lever Brothers Co
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Filing: 1955-08-16
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Granted: 1959-09-08
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Expires: 1975-08-16
Abstract
No abstract record available.
Inventors
- 👤 Edgar E Ruff
- 👤 Elwin E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:51
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0073; C11D3/02; C11D3/04; C11D3/046; C11D3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE PROCESS OF CLEANING ARTICLES FORMED OF COPPER AND COPPER AND NICKEL ALLOYS WITHOUT IMPARTING APPRECIABLE TARNISH THERETO WHICH COMPRISES WASHING SAID ARTICLES WITH A DETERGENT COMPOSITION CONSISTING ESSENTIALLY OFAN ALKALI METAL POLYPHOSPHATE WHICH IN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 7 TO ABOUT 11 TARNISHES COPPER AND COPPER AND NICKEL ALLOYS AND A WATER SOLUBLE STANNOUS SALT IN AMOUNT TO LESSEN THE TARNISHING ACTION OF THE POLYPHOSPHATE.
Claim 2
Dependent Claim
70 words
THE PROCESS OF CLEANING ARTICLES FORMED OF COPPER AND COPPER AND NICKEL ALLOYS WITHOUT IMPARTING APPRECIABLE TARNISH THERETO WHICH COMPRISES WASHING SAID ARTICLES WITH A DETERGENT COMPOSITION CONSISTING ESSENTIALLY OFAN ALKALI METAL POLYPHOSPHATE WHICH IN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 7 TO ABOUT 11 TARNISHES COPPER AND COPPER AND NICKEL ALLOYS AND A WATER SOLUBLE STANNOUS SALT IN AMOUNT TO LESSEN THE TARNISHING ACTION OF THE POLYPHOSPHATE.
References Cited (Backward Citations)
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Cited
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Cited
US2618603A
Cited
US2618604A
Cited
US2759891A
Cited
US2764242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |