Patent US3504676A successfully refreshed from Google Patents.
US2293100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Art of and means for engraving or cutting substantially invisible marks or the like in diamonds and other articles
Assignee: Individual
•
Filing: 1939-11-02
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Granted: 1942-08-18
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Expires: 1959-11-02
Abstract
No abstract record available.
Inventors
- 👤 Baumgold Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:00
CPC Classifications
B; B44; B44B; B44B3/00; B44B3/005; B44B3/001; B44B3/002; Y; Y10; Y10S; Y10S82/00; Y10S82/904; Y10T; Y10T409/00; Y10T409/30; Y10T409/30084; Y10T409/301176; Y10T409/301232
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) | 1945-08-17 | 1946-02-16 | 1946-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-08-17 | 1950-02-16 | 1950-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-08-17 | 1954-02-16 | 1954-08-18 | $7700.00 | Window Closed / Lapsed |