US2964882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct outlet insert and tool for opening same
Assignee: National Supply Co
•
Filing: 1957-07-22
•
Granted: 1960-12-20
•
Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 James W Hudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:17
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/02; H02G3/08; H02G3/18; H02G3/185; E; E04; E04F; E04F19/00; E04F19/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1229576A
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US1715474A
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US1965087A
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US1984356A
Cited
US1954481A
Cited
US2097394A
Cited
GB459979A
Cited
US2207301A
Cited
US2297139A
Cited
US2830662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |