US2567716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange unit
Assignee: Individual
•
Filing: 1947-02-14
•
Granted: 1951-09-11
•
Expires: 1967-02-14
Abstract
No abstract record available.
Inventors
- 👤 Richard W Kritzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
F; F25; F25B; F25B39/00; F25B39/02; F25B2339/00; F25B2339/02; F25B2339/023; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373; Y10T29/49826; Y10T29/49908; Y10T29/49938
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1244507A
Cited
US1367134A
Cited
GB159933A
Cited
FR538122A
Cited
US1607172A
Cited
GB260414A
Cited
GB274664A
Cited
US1929952A
Cited
GB449483A
Cited
US2050993A
Cited
US2092170A
Cited
US2217702A
Cited
US2170774A
Cited
US2271538A
Cited
US2494548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |