US3518830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor heated tube and shell heat exchanger system and method of purging
Assignee: Westinghouse Electric Corp
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Filing: 1968-10-17
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Granted: 1970-07-07
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Expires: 1988-10-17
Abstract
No abstract record available.
Inventors
- 👤 Paul W Viscovich
- 👤 Allan A Dunnavant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:58
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/26; F22B37/266; F01; F01K; F01K3/00; F01K3/18; F01K3/26; F01K3/262; F01K3/265; F22G; F22G1/00; F22G1/005
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) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |