Patent US1541357A successfully refreshed from Google Patents.
US2525178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removing silver films from mirrors with phosphoric acid
Assignee: Turco Products Inc
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Filing: 1947-01-18
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Granted: 1950-10-10
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Expires: 1967-01-18
Abstract
No abstract record available.
Inventors
- 👤 Earvy R Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:02
CPC Classifications
C; C03; C03C; C03C23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS OF REMOVING SILVER FILMS FROM MIRRORS WHICH COMPRISES IMMERSING SAID MIRRORS IN A SOLUTION OF ORTHO-PHOSPHORIC ACID IN WATER, SAID SOLUTION ALSO CONTAINING A SURFACE ACTIVE AGENT, AT A TEMPERATURE BELOW THE BOILING POINT OF THE MIRROR STRIPPING AGENT, AND REMOVING THE STRIPPED MIRROR.
Claim 2
Dependent Claim
46 words
A PROCESS OF REMOVING SILVER FILMS FROM MIRRORS WHICH COMPRISES IMMERSING SAID MIRRORS IN A SOLUTION OF ORTHO-PHOSPHORIC ACID IN WATER, SAID SOLUTION ALSO CONTAINING A SURFACE ACTIVE AGENT, AT A TEMPERATURE BELOW THE BOILING POINT OF THE MIRROR STRIPPING AGENT, AND REMOVING THE STRIPPED MIRROR.
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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |