Patent US2628199A successfully refreshed from Google Patents.
US2628199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tarnish remover
Assignee: Individual
•
Filing: 1949-12-21
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Granted: 1953-02-10
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Expires: 1969-12-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Lowenheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:07
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A CLEANING COMPOSITION FOR SILVER- AND COPPER-CONTAINING METAL SURFACES CONSISTING ESSENTIALLY OF 1 PART BY WEIGHT OF AN ACID HAVING A PK IN THE RANGE OF 1 TO 5 AND ABOUT 3 TO 5 PARTS BY WEIGHT OF THIOUREA, SAID ACID BEING WATERSOLUBLE, STABLE, NON-OXIDIZING, AND FORMING NO WATER-INSOLUBLE COMPOUNDS WITH COPPER OR SILVER.
Claim 2
Dependent Claim
54 words
A CLEANING COMPOSITION FOR SILVER- AND COPPER-CONTAINING METAL SURFACES CONSISTING ESSENTIALLY OF 1 PART BY WEIGHT OF AN ACID HAVING A PK IN THE RANGE OF 1 TO 5 AND ABOUT 3 TO 5 PARTS BY WEIGHT OF THIOUREA, SAID ACID BEING WATERSOLUBLE, STABLE, NON-OXIDIZING, AND FORMING NO WATER-INSOLUBLE COMPOUNDS WITH COPPER OR SILVER.
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) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |