US2819371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1954-01-19
•
Granted: 1958-01-07
•
Expires: 1974-01-19
Abstract
No abstract record available.
Inventors
- 👤 Donald F Aldrich
- 👤 Lyle H Wall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:54
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/2033; G05D23/2036; Y; Y10; Y10S; Y10S236/00; Y10S236/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2148491A
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US2220028A
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US2265512A
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US2298847A
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US2376488A
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US2427945A
Cited
US2500061A
Cited
US2490965A
Cited
US2510041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |