Patent US3517731A successfully refreshed from Google Patents.
US3517731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-sealing fluid/fluid heat exchanger
Assignee: RTX Corp
•
Filing: 1967-09-25
•
Granted: 1970-06-30
•
Expires: 1987-09-25
Abstract
No abstract record available.
Inventors
- 👤 Edward A Rothman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:01
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0062
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2512875A
Cited
US1863586A
Cited
US2846198A
Cited
US2985434A
Cited
US3216484A
Cited
US3203404A
Cited
US3247899A
Cited
US3241607A
Cited
US3252510A
Cited
US3428614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |