Patent US2312622A successfully refreshed from Google Patents.
US2312622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam boiler
Assignee: Individual
•
Filing: 1940-01-22
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Granted: 1943-03-02
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Expires: 1960-01-22
Abstract
No abstract record available.
Inventors
- 👤 John E Brantly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:16
CPC Classifications
F; F22; F22B; F22B13/00; F22B13/02; F22B13/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-03-01 | 1946-08-31 | 1947-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-03-01 | 1950-08-31 | 1951-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-03-01 | 1954-08-31 | 1955-03-02 | $7700.00 | Window Closed / Lapsed |