US2539293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damper for radiators
Assignee: Vulcan Radiator Co
•
Filing: 1948-03-30
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Granted: 1951-01-23
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Expires: 1968-03-30
Abstract
No abstract record available.
Inventors
- 👤 Fred A Balzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:15
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1413; F24D; F24D19/00; F24D19/02; F24D19/04; Y; Y10; Y10S; Y10S165/00; Y10S165/092; Y10S165/126; Y10S165/129
Claims Analysis
Total Claims: 0
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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) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |