US2593094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and ventilating system
Assignee: Transit Research Corp
•
Filing: 1945-05-03
•
Granted: 1952-04-15
•
Expires: 1965-05-03
Abstract
No abstract record available.
Inventors
- 👤 Lebert E Blue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:09
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00357; B60H1/00371; B61; B61D; B61D27/00; B61D27/0018; B60H1/00007; B60H1/00207; B60H2001/00221
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1024438A
Cited
US1615164A
Cited
US2115472A
Cited
US2053606A
Cited
US2058252A
Cited
US2178644A
Cited
US2130131A
Cited
FR843059A
Cited
US2275120A
Cited
US2197740A
Cited
US2294363A
Cited
US2351096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |