US2680956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural stage refrigeration system
Assignee: HASKRIS CO
•
Filing: 1951-12-19
•
Granted: 1954-06-15
•
Expires: 1971-12-19
Abstract
No abstract record available.
Inventors
- 👤 Frank L Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:44
CPC Classifications
F; F25; F25B; F25B7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1054456A
Cited
US1786791A
Cited
US2181855A
Cited
US2214699A
Cited
US2492610A
Cited
US2498861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |