US3196942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger construction including tubular closure plates
Assignee: RTX Corp
•
Filing: 1963-07-05
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Granted: 1965-07-27
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Expires: 1983-07-05
Abstract
No abstract record available.
Inventors
- 👤 Kenneth R Prentiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:13
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28D9/0068; F28F; F28F2250/00; F28F2250/10; F28F2250/102; F28F2265/00; F28F2265/26; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/359
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |