Patent US2664861A successfully refreshed from Google Patents.
US2664861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam boiler
Assignee: Individual
•
Filing: 1950-07-27
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Granted: 1954-01-05
•
Expires: 1970-07-27
Abstract
No abstract record available.
Inventors
- 👤 Carl Z Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:37
CPC Classifications
F; F22; F22B; F22B13/00; F22B13/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US218542A
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US399975A
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US822607A
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US1164803A
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GB139896A
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US1527740A
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US1664914A
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US1681726A
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US2142626A
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US2210830A
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US2250900A
Cited
US2428905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |