Patent FR1061177A successfully refreshed from Google Patents.
US2311374A
Expired / Lapsed
US
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Automatic fire control system for ventilating or air conditioning systems
Assignee: American District Telegraph Co
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Filing: 1938-11-01
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Granted: 1943-02-16
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Expires: 1958-11-01
Abstract
No abstract record available.
Inventors
- 👤 Paul M Farmer
- 👤 Francis C Evans
- 👤 Richard F Spamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:15
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/24; A62C2/246; A62C2/247
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-02-15 | 1946-08-17 | 1947-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-02-15 | 1950-08-17 | 1951-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-02-15 | 1954-08-17 | 1955-02-16 | $7700.00 | Window Closed / Lapsed |