US2858113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: RTX Corp
•
Filing: 1954-10-14
•
Granted: 1958-10-28
•
Expires: 1974-10-14
Abstract
No abstract record available.
Inventors
- 👤 John R Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:45
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/08; F28F; F28F9/00; Y; Y10; Y10S; Y10S165/00; Y10S165/001; Y10S165/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1238053A
Cited
FR557583A
Cited
US1908733A
Cited
US2093825A
Cited
US2187555A
Cited
US2187470A
Cited
FR828108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |