US2635866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiant tube portable furnace
Assignee: Individual
•
Filing: 1950-04-05
•
Granted: 1953-04-21
•
Expires: 1970-04-05
Abstract
No abstract record available.
Inventors
- 👤 Oscar R Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:07
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/663
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1427319A
Cited
US2041312A
Cited
US2041341A
Cited
US2051099A
Cited
US2171777A
Cited
US2293813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |