US2621856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firing unit control for heating systems
Assignee: ITT Bell and Gossett Inc
•
Filing: 1947-12-22
•
Granted: 1952-12-16
•
Expires: 1967-12-22
Abstract
No abstract record available.
Inventors
- 👤 Lawrence J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:38
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; G05D23/27535; G05D23/27537; F; F24; F24H; F24H9/00; F24H9/20; F24H9/2007; F24H9/2035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2510481A
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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) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |