US3478667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Top discharge air duct system and air ducts therefor
Assignee: Wolff and Munier Inc
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Filing: 1969-01-06
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Granted: 1969-11-18
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Expires: 1989-01-06
Abstract
No abstract record available.
Inventors
- 👤 Paul A Bourquin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:27
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04; F16; F16L; F16L59/00; F16L59/14; F16L59/147; F24F13/00; F24F13/02; F24F13/0254
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |