US2977869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable core air diffusers
Assignee: Individual
•
Filing: 1953-09-21
•
Granted: 1961-04-04
•
Expires: 1973-09-21
Abstract
No abstract record available.
Inventors
- 👤 Cortland N O'day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:13
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1711458A
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US1643863A
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US2240617A
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US2229747A
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US2403291A
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US2376705A
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US2577771A
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US2621579A
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US2671394A
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US2607282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |