US2430890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and air-conditioning system
Assignee: —
•
Filing: —
•
Granted: 1947-11-18
•
Expires: 1964-11-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:19
CPC Classifications
—
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2164718A
Cited
US836826A
Cited
US1083395A
Cited
US1164818A
Cited
US1941365A
Cited
US1983294A
Cited
US1941734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |