US2559253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system controller
Assignee: Individual
•
Filing: 1946-03-08
•
Granted: 1951-07-03
•
Expires: 1966-03-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Lingen
- 👤 Lloyd E Cross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:30
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; F24D19/1009; F24D19/1015; F24D19/1024; F24H; F24H15/00; F24H15/20; F24H15/212; F24H15/219; F24H15/30; F24H15/355; F24H15/36
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1871093A
Cited
US1981679A
Cited
US2067629A
Cited
US2188775A
Cited
US2235692A
Cited
US2440052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |