US3400758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical baffle means in a tubular heat exchanger
Assignee: United Aircraft Products Inc
•
Filing: 1966-05-16
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Granted: 1968-09-10
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Expires: 1986-05-16
Abstract
No abstract record available.
Inventors
- 👤 Lee Man Suk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:35
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/22; Y; Y10; Y10S; Y10S159/00; Y10S159/901; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/416; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/4938
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1335506A
Cited
US1505429A
Cited
US1522866A
Cited
US1469193A
Cited
US1782409A
Cited
US1764200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |