US2916054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knockdown sectional air conduits
Assignee: Individual
•
Filing: 1953-11-03
•
Granted: 1959-12-08
•
Expires: 1973-11-03
Abstract
No abstract record available.
Inventors
- 👤 William D Callan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:24
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0209; F16; F16L; F16L23/00; F16L23/12; F16L23/14; F16L9/00; F16L9/003; F24F13/0263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2447272A
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US2741341A
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US2691432A
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US2670763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |