US2726682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible duct
Assignee: AERODUCT Inc
•
Filing: 1952-11-07
•
Granted: 1955-12-13
•
Expires: 1972-11-07
Abstract
No abstract record available.
Inventors
- 👤 Addison B Conroy
- 👤 Alvin E Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:58
CPC Classifications
F; F16; F16L; F16L33/00; F16L21/00; F16L21/002; F16L21/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1316052A
Cited
US1227690A
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GB236127A
Cited
US1584935A
Cited
US1883086A
Cited
US1939872A
Cited
US2200967A
Cited
US2189172A
Cited
US2428652A
Cited
US2551631A
Cited
US2570259A
Cited
US2693223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |