US3223155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Header construction for unit heater coil
Assignee: American Air Filter Co Inc
•
Filing: 1963-04-22
•
Granted: 1965-12-14
•
Expires: 1983-04-22
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:32
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/0233; F28D1/024; F28F; F28F9/00; F28F9/02; F28F9/0202; F28F9/0204; F28F9/0214; F28F9/0217; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/471; Y10S165/472
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US118779A
Cited
US1288055A
Cited
US1922581A
Cited
US2159913A
Cited
US2260594A
Cited
GB616659A
Cited
US2863645A
Cited
US2934321A
Cited
US2952446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |