US2221530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerating system
Assignee: AIR CONDITIONING EQUIPMENT Inc
•
Filing: 1937-07-06
•
Granted: 1940-11-12
•
Expires: 1957-07-06
Abstract
No abstract record available.
Inventors
- 👤 John J Strang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:40
CPC Classifications
F; F25; F25B; F25B39/00; F25B39/04; F25B2339/00; F25B2339/04; F25B2339/041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-11-12 | 1944-05-13 | 1944-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-12 | 1948-05-13 | 1948-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-12 | 1952-05-13 | 1952-11-12 | $7700.00 | Window Closed / Lapsed |