Patent US1994633A successfully refreshed from Google Patents.
US1994633A
Expired / Lapsed
US
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Solution and method for removing silver from the back of mirrors
Assignee: Individual
•
Filing: 1933-11-29
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Granted: 1935-03-19
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Expires: 1953-11-29
Abstract
No abstract record available.
Inventors
- 👤 Boyd Samuel Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:51
CPC Classifications
C; C03; C03C; C03C23/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49751; Y10T29/49755
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) | 1938-03-18 | 1938-09-17 | 1939-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-18 | 1942-09-17 | 1943-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-18 | 1946-09-17 | 1947-03-19 | $7700.00 | Window Closed / Lapsed |