US2532550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam heating system
Assignee: Herman Nelson Co
•
Filing: 1948-05-21
•
Granted: 1950-12-05
•
Expires: 1968-05-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:47
CPC Classifications
F; F24; F24D; F24D1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1441449A
Cited
US731776A
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US1993832A
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US1957867A
Cited
US2041282A
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US2060844A
Cited
US2213053A
Cited
US2366332A
Cited
US2346590A
Cited
US2402610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |