US2561305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary heat exchanger in refrigeration system
Assignee: Individual
•
Filing: 1947-04-21
•
Granted: 1951-07-17
•
Expires: 1967-04-21
Abstract
No abstract record available.
Inventors
- 👤 Alexander S Limpert
- 👤 Robin J Limpert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:07
CPC Classifications
F; F25; F25D; F25D11/00; F25D11/02; F25D11/025; F25D25/00; F25D25/02; F25D25/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1798951A
Cited
US1922091A
Cited
US1926384A
Cited
US2174482A
Cited
US2336418A
Cited
US2310117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |