US3528606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature responsive foundation ventilator
Assignee: ALVIN E WITTEN
•
Filing: 1968-07-29
•
Granted: 1970-09-15
•
Expires: 1988-07-29
Abstract
No abstract record available.
Inventors
- 👤 Alvin E Witten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:09
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/15; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1358193A
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US2750868A
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US2975975A
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US3165999A
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US3251548A
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US3368756A
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US3450344A
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US3436016A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |