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Patent US2529690A successfully refreshed from Google Patents.
US2529690A
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US
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Heating apparatus
Assignee: Selas Corp of America
•
Filing: 1945-06-29
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Granted: 1950-11-14
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Expires: 1965-06-29
Abstract
No abstract record available.
Inventors
- 👤 Frederic O Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:05
CPC Classifications
C; C21; C21D; C21D9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2067436A
Cited
GB383899A
Cited
US1946971A
Cited
US2113426A
Cited
US2215080A
Cited
US2150534A
Cited
US2398398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |