US2709427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidifier for air heating furnaces
Assignee: Individual
•
Filing: 1951-04-21
•
Granted: 1955-05-31
•
Expires: 1971-04-21
Abstract
No abstract record available.
Inventors
- 👤 Perlman Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:59
CPC Classifications
F; F24; F24D; F24D5/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7339; Y10T137/7355
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1720241A
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US1778573A
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US1958224A
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US2292407A
Cited
US2557042A
Cited
US2569512A
Cited
US2573158A
Cited
US2565210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |