US2723616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating and heating apparatus
Assignee: American Air Filter Co Inc
•
Filing: 1951-10-15
•
Granted: 1955-11-15
•
Expires: 1971-10-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:47
CPC Classifications
F; F24; F24F; F24F1/00; F24F1/0007; F24F1/0035; F24F1/0038; F24F1/0043; F24F1/005; F24F1/0071; F24F1/0073
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1485887A
Cited
US1760166A
Cited
US1919625A
Cited
US1977248A
Cited
US2018236A
Cited
US1913681A
Cited
US2029368A
Cited
US1988745A
Cited
US2023447A
Cited
US2240354A
Cited
US2112601A
Cited
US2176319A
Cited
US2180459A
Cited
US2224407A
Cited
US2235500A
Cited
US2349541A
Cited
US2275772A
Cited
US2327664A
Cited
US2276850A
Cited
US2359057A
Cited
US2532550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |