US2427780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning of buildings by passing air through hollow foundation blocks
Assignee: Mcdowell & Torrence Lumber Co
•
Filing: 1944-06-10
•
Granted: 1947-09-23
•
Expires: 1964-06-10
Abstract
No abstract record available.
Inventors
- 👤 Malcolm E Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:58
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US982721A
Cited
US1065762A
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US1058949A
Cited
US1148228A
Cited
US1454310A
Cited
US2210960A
Cited
US2192567A
Cited
US2333556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-22 | 1951-03-24 | 1951-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-22 | 1955-03-24 | 1955-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-22 | 1959-03-24 | 1959-09-23 | $7700.00 | Window Closed / Lapsed |