Patent US2774847A successfully refreshed from Google Patents.
US2774847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit controller for air heating control system
Assignee: General Controls Co
•
Filing: 1955-02-07
•
Granted: 1956-12-18
•
Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 William A Ray
- 👤 Evan J Davidson
- 👤 William F Keller
- 👤 Arthur P Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:11
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; G05D23/27535; G05D23/2754
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) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |