US2614542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indirectly heated coil for boilers with vertical sections
Assignee: Individual
•
Filing: 1950-06-21
•
Granted: 1952-10-21
•
Expires: 1970-06-21
Abstract
No abstract record available.
Inventors
- 👤 Anthony J Donohue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:55
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/48; F24H1/52; F24D; F24D1/00; F24D1/005; F24H1/22; F24H1/24; F24H1/30; F24H1/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US672555A
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US1142433A
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US1382670A
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US1520084A
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US1553233A
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CH237150A
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US2407941A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |