Patent US415131A successfully refreshed from Google Patents.
US2829504A
Expired / Lapsed
US
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Air conditioning system for dwellings
Assignee: Individual
•
Filing: 1956-06-25
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Granted: 1958-04-08
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Expires: 1976-06-25
Abstract
No abstract record available.
Inventors
- 👤 Ralph C Schlichtig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:00
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/001; F25; F25B; F25B13/00; F25B41/00; F25B41/20; F25B41/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2123498A
Cited
US2293482A
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US2474304A
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US2585748A
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US2680354A
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US2666298A
Cited
US2716870A
Cited
US2749724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |