US2927780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination heating and cooling unit
Assignee: H B SMITH CO Inc
•
Filing: 1957-02-21
•
Granted: 1960-03-08
•
Expires: 1977-02-21
Abstract
No abstract record available.
Inventors
- 👤 Lauren E Seeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:30
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0233; F28D1/024; F24; F24D; F24D3/00; F24F; F24F5/00; F24F5/0003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US593737A
Cited
US1559213A
Cited
US1788823A
Cited
US1845243A
Cited
US1945379A
Cited
US2724579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |