US2839046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and ventilating apparatus
Assignee: Individual
•
Filing: 1954-03-23
•
Granted: 1958-06-17
•
Expires: 1974-03-23
Abstract
No abstract record available.
Inventors
- 👤 Wunibald I E Kamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:24
CPC Classifications
F; F23; F23C; F23C15/00; B; B60; B60H; B60H1/00; B60H1/22; B60H1/2203; B60H1/2212; B60H2001/2268; B60H2001/2271
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2612748A
Cited
US2643107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |