Patent US3552638A successfully refreshed from Google Patents.
Patent US1657066A successfully refreshed from Google Patents.
US1657066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating system
Assignee: Burke Cooling & Heating System
•
Filing: 1924-10-24
•
Granted: 1928-01-24
•
Expires: 1944-10-24
Abstract
No abstract record available.
Inventors
- 👤 Horace B Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:52
CPC Classifications
B; B61; B61D; B61D27/00; B61D27/009
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1931-01-23 | 1931-07-25 | 1932-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-01-23 | 1935-07-25 | 1936-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-01-23 | 1939-07-25 | 1940-01-24 | $7700.00 | Window Closed / Lapsed |