US2454511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion air heater having variable output with constant temperature
Assignee: Stewart Warner Corp
•
Filing: 1944-04-13
•
Granted: 1948-11-23
•
Expires: 1964-04-13
Abstract
No abstract record available.
Inventors
- 👤 Seymour E Heymann
- 👤 Jr William A Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:54
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D13/08; Y; Y02; Y02T; Y02T50/00; Y02T50/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE16796E
Cited
US987732A
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US1583238A
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US1919413A
Cited
US1958913A
Cited
US2403186A
Cited
US2381358A
Cited
US2429101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |