Patent US5070516A successfully refreshed from Google Patents.
Patent US2863644A successfully refreshed from Google Patents.
US2863644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative heat exchange apparatus
Assignee: Individual
•
Filing: 1956-12-04
•
Granted: 1958-12-09
•
Expires: 1976-12-04
Abstract
No abstract record available.
Inventors
- 👤 Fallon John Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:55
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F02; F02C; F02C7/00; F02C7/08; F02C7/10; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/01
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |