Patent US3720154A successfully refreshed from Google Patents.
US3720154A
Expired / Lapsed
US
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Register structures
Assignee: Individual
•
Filing: 1972-01-27
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Granted: 1973-03-13
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Expires: 1992-01-27
Abstract
Abstract IMPROVED REGISTER STRUCTURES WHICH ARE ASSEMBLED WITHOUT USE OF WELDS, OR RIVETS OR SCREWS, OR OTHER SIMILAR CONNECTION DEVICES. THE FACE PLATES OF THE REGISTERS HAVE OPPOSITELY DIRECTED LOUVERS OR VANES WITH WHICH THE FRAME AND CLOSURE ASSEMBLY ARE ENGAGED. THE VANES WITH WHICH SUCH ASSEMBLIES ARE ENGAGED ARE OPPOSITELY ANGULAR, AND THE FRAME PARTS ARE ENGAGED THEREWITH SO THAT THE PARTS ARE FIRMLY HELD.
Inventors
- 👤 F Biggi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:44
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |