Patent US2638334A successfully refreshed from Google Patents.
US2638334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for the heat treatment of materials
Assignee: Individual
•
Filing: 1950-07-12
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Granted: 1953-05-12
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Expires: 1970-07-12
Abstract
No abstract record available.
Inventors
- 👤 Jones John Frederick Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:55
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1363188A
Cited
US1824876A
Cited
US1732138A
Cited
US1777125A
Cited
US2085811A
Cited
US2504320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |