US2501141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for refrigerating railroad cars
Assignee: Individual
•
Filing: 1948-04-19
•
Granted: 1950-03-21
•
Expires: 1968-04-19
Abstract
No abstract record available.
Inventors
- 👤 Kenneth V Plummer
- 👤 Robert D Pike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:09
CPC Classifications
B; B61; B61D; B61D27/00; B61D27/0018; B61D27/0027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2256197A
Cited
US2324749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |