Patent US3444921A successfully refreshed from Google Patents.
US3444921A
Expired / Lapsed
US
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Environmental control system
Assignee: FRANK CARAPICO JR
•
Filing: 1968-09-05
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Granted: 1969-05-20
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Expires: 1988-09-05
Abstract
No abstract record available.
Inventors
- 👤 Frank Carapico Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:10
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F3/1405; F24F11/00; F24F11/70; F24F11/80; F24F11/83; F24F11/84; F24F11/30; F24F2003/144; F24F2003/1446; F24F2110/00; F24F2110/10; F24F2110/20; F24F2140/00; F24F2140/10; F24F2140/12; F24F2221/00; F24F2221/54; F24F6/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2143356A
Cited
US2309411A
Cited
US2177496A
Cited
US2310955A
Cited
US2713995A
Cited
US3316731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |