US3468028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial crowns for teeth
Assignee: 3M Unitek Corp
•
Filing: 1964-10-09
•
Granted: 1969-09-23
•
Expires: 1984-10-09
Abstract
No abstract record available.
Inventors
- 👤 Robert A Sunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:56
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/70; A61C5/77
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2154499A
Cited
US2219058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |