US2834583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Houdaille Industries Inc
•
Filing: 1955-09-19
•
Granted: 1958-05-13
•
Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Oldberg Oscar
- 👤 Ray A Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:58
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB158629A
Cited
US2038912A
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US2023739A
Cited
US2051402A
Cited
US2427336A
Cited
US2458670A
Cited
US2612351A
Cited
US2581778A
Cited
US2712917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |