Patent US2235642A successfully refreshed from Google Patents.
US2235642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle ventilating and heating apparatus
Assignee: Evans Products Co
•
Filing: 1937-04-03
•
Granted: 1941-03-18
•
Expires: 1957-04-03
Abstract
No abstract record available.
Inventors
- 👤 Alfred R Lintern
- 👤 Peter J Miller
- 👤 William T Downs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:36
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00007; B60H1/00021; B60H1/00035; B60H1/00042; B60H2001/00078; B60H2001/00085; B60H2001/00092
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) | 1944-03-17 | 1944-09-16 | 1945-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-03-17 | 1948-09-16 | 1949-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-03-17 | 1952-09-16 | 1953-03-18 | $7700.00 | Window Closed / Lapsed |