US2563268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling duct system
Assignee: Individual
•
Filing: 1946-08-26
•
Granted: 1951-08-07
•
Expires: 1966-08-26
Abstract
No abstract record available.
Inventors
- 👤 George R D Pettingell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:13
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/28; H02G3/281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1540893A
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GB546954A
Cited
US2330935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |