US2471437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing sapphire hollow articles
Assignee: Elgin National Watch Co
•
Filing: 1945-04-19
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Granted: 1949-05-31
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Expires: 1965-04-19
Abstract
No abstract record available.
Inventors
- 👤 Lester Raymond Holmes
- 👤 Cannon Melvin Croxall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:23
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/04; C30B11/08; C30B11/10; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1028
Claims Analysis
Total Claims: 0
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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) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |