US3451473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger construction
Assignee: RTX Corp
•
Filing: 1967-04-11
•
Granted: 1969-06-24
•
Expires: 1987-04-11
Abstract
No abstract record available.
Inventors
- 👤 Robert G Urie
- 👤 Edward W Radtke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:18
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062; F28D9/0075; F28F; F28F2265/00; F28F2265/16; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/362
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |