US3555683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental prosthesis with a valve and vacuum chamber
Assignee: Individual
•
Filing: 1967-10-24
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Granted: 1971-01-19
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Expires: 1987-10-24
Abstract
Abstract A DENTAL PROSTHESIS WITH A VALVE AND VACUUM CHAMBER IS CHARACTERISED IN THAT THE VALVE IS MADE OF RUST-PROOF MATERIAL AND HAS A RIGID OUTER MEMBER AND A MOVABLE ASSEMBLY WITH A STOPPER FOR PREVENTING PENETRATION OF FOREIGN BODIES AND A SEAL FOR MAINTAINING THE VACUUM, THE STOPPER AND THE SEAL BEING APPLIED AGAINST RESPECTIVE SEATINGS BY SPRING MEANS AND THAT THE VACUUM CHAMBER IS OF SMALLER CROSS-SECTION IN THE PORTIONS THEREOF LYING WITHIN THE EXTENSION OF THE INCISOR AND CANINE TEETH THAN IT IS IN THE PORTIONS THEREOF LOCATED OPPOSITE THE MOLARS.
Inventors
- 👤 Dragutin Ivan Gregorovic
- 👤 Georges L E R Feroumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:43
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/24; A61C13/245; A61C13/25
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |