Patent US2819882A successfully refreshed from Google Patents.
US2819882A
Expired / Lapsed
US
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Heat exchange apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1953-10-01
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Granted: 1958-01-14
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Expires: 1973-10-01
Abstract
No abstract record available.
Inventors
- 👤 Richard M Stephani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:18
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/06; F22; F22D; F22D1/00; F22D1/32; F28D7/0066; F28D7/0083
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) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |