US2829102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nontarnishing detergent compositions containing ferric salts
Assignee: Lever Brothers Co
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Filing: 1955-10-26
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Granted: 1958-04-01
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Expires: 1975-10-26
Abstract
No abstract record available.
Inventors
- 👤 Edgar E Ruff
- 👤 Elwin E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:56
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0073; C11D3/02; C11D3/04; C11D3/046; C11D3/06; C11D3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A POLYPHOSPHATE DETERGENT COMPOSITION CONSISTING ESSENTIALLY OF A WATER-SOLUBLE ALKALI METAL POLYPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF TETRASODIUM AND SELECTED FROM THE GROUP CONSISTING OF TETRASODIUM AND HEXAMETAPHOSPHATES, AND HEXASODIUM AND HEXAPOTASSIUM TETRAPOLYPHOSPHATES WHICH IN AQUEOUS SOLUTION TARNISHES GERMAN SILVER, FROM ABOUT 1% TO ABOUT 15% OF A WATERSOLUBLE FERRIC SALT BASED ON THE WEIGHT OF POLYPHOSPHATE AND FROM ABOUT 4% TO ABOUT 27% OF AN ALKALI METAL SILICATE HAVING A SIO2:M2O RATIO OF ABOUT 2.5 WHERE M IS AN ALKALI METAL, THE AMOUNTS OF SAID FERRIC SALT AND SILICATE BEING SUFFICIENT TO INHIBIT SUCH TARNISHING.
Claim 2
Dependent Claim
97 words
A POLYPHOSPHATE DETERGENT COMPOSITION CONSISTING ESSENTIALLY OF A WATER-SOLUBLE ALKALI METAL POLYPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF TETRASODIUM AND SELECTED FROM THE GROUP CONSISTING OF TETRASODIUM AND HEXAMETAPHOSPHATES, AND HEXASODIUM AND HEXAPOTASSIUM TETRAPOLYPHOSPHATES WHICH IN AQUEOUS SOLUTION TARNISHES GERMAN SILVER, FROM ABOUT 1% TO ABOUT 15% OF A WATERSOLUBLE FERRIC SALT BASED ON THE WEIGHT OF POLYPHOSPHATE AND FROM ABOUT 4% TO ABOUT 27% OF AN ALKALI METAL SILICATE HAVING A SIO2:M2O RATIO OF ABOUT 2.5 WHERE M IS AN ALKALI METAL, THE AMOUNTS OF SAID FERRIC SALT AND SILICATE BEING SUFFICIENT TO INHIBIT SUCH TARNISHING.
References Cited (Backward Citations)
US2618603A
Cited
US2764242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |