US2420757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange assembly
Assignee: Borg Warner Corp
•
Filing: 1943-11-05
•
Granted: 1947-05-20
•
Expires: 1963-11-05
Abstract
No abstract record available.
Inventors
- 👤 George R Neumann
- 👤 Eugene F Farrell
- 👤 Jr Charles S Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:16
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1027961A
Cited
US1492163A
Cited
US1839880A
Cited
DE686790C
Cited
US2288028A
Cited
US2286854A
Cited
US2314089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |