US2500989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical apparatus
Assignee: RK Le Blond Machine Tool Co
•
Filing: 1946-07-10
•
Granted: 1950-03-21
•
Expires: 1966-07-10
Abstract
No abstract record available.
Inventors
- 👤 Albert L Hartley
- 👤 Adolph H Davis
- 👤 William D Whalen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:00
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2202758A
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US2189460A
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US2326840A
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GB520629A
Cited
US2264752A
Cited
US2368087A
Cited
US2407230A
Cited
US2429776A
Cited
US2457654A
Cited
US2448657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |