Patent US2775188A successfully refreshed from Google Patents.
US2775188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for heating and ventilating rooms, particularly school rooms and the like
Assignee: Individual
•
Filing: 1952-11-19
•
Granted: 1956-12-25
•
Expires: 1972-11-19
Abstract
No abstract record available.
Inventors
- 👤 Russell R Gannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:45
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0233; F28D1/024
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1626172A
Cited
US1971173A
Cited
US2159219A
Cited
US2235023A
Cited
US2235500A
Cited
US2284161A
Cited
US2261852A
Cited
US2281615A
Cited
US2363294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |