US3528224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-conditioning apparatus
Assignee: Boeing North American Inc
•
Filing: 1967-12-27
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Granted: 1970-09-15
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Expires: 1987-12-27
Abstract
No abstract record available.
Inventors
- 👤 Charles E Warn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:29
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; B; B64; B64G; B64G1/00; B64G1/22; B64G1/46; B64G1/50; F24F3/14; F24F2003/1458
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3242651A
Cited
US3160486A
Cited
US3263400A
Cited
US3338034A
Cited
US3323288A
Cited
US3355860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |