US2439784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of boiling out steam boilers prior to placing them in operation and composition therefor
Assignee: Hall Labs LLC
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Filing: 1944-12-30
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Granted: 1948-04-13
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Expires: 1964-12-30
Abstract
No abstract record available.
Inventors
- 👤 Wendell W Cerna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:51
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |