Patent US2383423A successfully refreshed from Google Patents.
US2383423A
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US
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Air purifying and conditioning system
Assignee: Pennsylvania Railroad Co
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Filing: 1943-08-27
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Granted: 1945-08-21
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Expires: 1963-08-27
Abstract
No abstract record available.
Inventors
- 👤 Carleton K Steins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:35
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00357; B60H1/00371; B61; B61D; B61D27/00; B61D27/0072; B61D37/00; B61D37/003; B60H1/00007; B60H1/00207; B60H2001/00235
Claims Analysis
Total Claims: 0
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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) | 1948-08-20 | 1949-02-19 | 1949-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-08-20 | 1953-02-19 | 1953-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-08-20 | 1957-02-19 | 1957-08-21 | $7700.00 | Window Closed / Lapsed |