US3552782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct connector system
Assignee: Individual
•
Filing: 1968-08-13
•
Granted: 1971-01-05
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Expires: 1988-08-13
Abstract
Abstract AIR CONDITIONING SYSTEM DUCTS OF COMPRESSED GLASS FIBER INSULATING BOARDS ARE CONNECTED TOGETHER AND TO DAMPERS, HEAT EXCHANGES, TURNING VANES. AND OTHER ACCESSORIES BY A SHEET-METAL RAIL FORMED TO RECEIVE AND SUPPORT LENGTHS OF DUCT.
Inventors
- 👤 John E O'neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:15
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0209; F16; F16L; F16L25/00; F16L25/0009; F16L59/00; F16L59/14; F16L59/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |