US2457069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system for heat exchange devices
Assignee: Robertshaw US Holding Corp
•
Filing: 1945-02-05
•
Granted: 1948-12-21
•
Expires: 1965-02-05
Abstract
No abstract record available.
Inventors
- 👤 Herbert H Rauh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:01
CPC Classifications
F; F25; F25B; F25B49/00; Y; Y10; Y10S; Y10S165/00; Y10S165/001; Y10S165/006
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |