US2840867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow building wall ventilating device
Assignee: Individual
•
Filing: 1955-04-08
•
Granted: 1958-07-01
•
Expires: 1975-04-08
Abstract
No abstract record available.
Inventors
- 👤 Shepard J Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:31
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/70; E04B1/7069; E04B1/7076; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53987
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1705371A
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US2353386A
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US2397803A
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US2513056A
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GB670870A
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US2664809A
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US2703911A
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US2764929A
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US2779065A
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US2782464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |