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Patent US2730873A successfully refreshed from Google Patents.
US2730873A
Expired / Lapsed
US
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Room air conditioners
Assignee: ED FRIEDRICH Inc
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Filing: 1953-05-19
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Granted: 1956-01-17
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Expires: 1973-05-19
Abstract
No abstract record available.
Inventors
- 👤 Hubert W Hardin
- 👤 Clinton C Brinkoeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:51
CPC Classifications
F; F24; F24F; F24F1/00; F24F1/02; F24F1/03; F24F1/031; F24F1/0328; F24F1/035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2282572A
Cited
US2299527A
Cited
US2357362A
Cited
US2269205A
Cited
US2472792A
Cited
US2488589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |