Patent US2887304A successfully refreshed from Google Patents.
US2887304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers
Assignee: Mersen SA
•
Filing: 1956-08-03
•
Granted: 1959-05-19
•
Expires: 1976-08-03
Abstract
No abstract record available.
Inventors
- 👤 Hilliard Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:54
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/02; F28F7/00; F28F7/02; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/395; Y10S165/396; Y10S165/905
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US106686A
Cited
US1571068A
Cited
US1799626A
Cited
US2499448A
Cited
US2466676A
Cited
US2699325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |