Patent US2551956A successfully refreshed from Google Patents.
US2551956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control for air to be heated in air-heating furnaces
Assignee: R J TEELA
•
Filing: 1946-05-16
•
Granted: 1951-05-08
•
Expires: 1966-05-16
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:46
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H15/00; F24H15/20; F24H15/208; F24H15/30; F24H15/345; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7837; Y10T137/7869; Y10T137/7871; Y10T137/794; Y10T137/8122
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |