US3404539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning apparatus
Assignee: LAING VORTEX Inc
•
Filing: 1967-04-10
•
Granted: 1968-10-08
•
Expires: 1987-04-10
Abstract
No abstract record available.
Inventors
- 👤 Laing Nikolaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/20; F24F1/00; F24F1/02; F24F1/022; F24F1/027; F24F1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123987A
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US2391859A
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US2644321A
Cited
US2719410A
Cited
US2723540A
Cited
US2942773A
Cited
US2719411A
Cited
US3035760A
Cited
US2934324A
Cited
US2924080A
Cited
US3176474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |