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Patent US2809812A successfully refreshed from Google Patents.
US2809812A
Expired / Lapsed
US
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Self-contained air conditioning apparatus for use in the roof hatch of a railway refrigerator car or the like
Assignee: Waukesha Motor Co
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Filing: 1955-03-09
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Granted: 1957-10-15
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Expires: 1975-03-09
Abstract
No abstract record available.
Inventors
- 👤 Melvin E Erickson
- 👤 Robert D Kern
- 👤 Newton H Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:23
CPC Classifications
F; F25; F25D; F25D19/00; F25D19/003; B; B61; B61D; B61D27/00; B61D27/0018; B61D27/0027; Y; Y10; Y10S; Y10S62/00; Y10S62/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |