Snap-type resilient retainer for excavating teeth
Abstract
Abstract A RETAINER FOR AN EXCAVATING TOOTH FORMED WITH A SLOT EXTENDING FORWARDLY FROM THE PROXIMAL END TO DIVIDE THE TOOTH INTO TWO GENERALLY RECTANGULAR CROSS-SECTION PRONGS. THE TOOTH IS RECEIVED IN A HOLDER HAVING A RECTANGULAR RECESS WHICH FITS AROUND THE EXTERIOR OF THE TOOTH. THE RETAINER IS A THREE-PART PIN HAVING A RESILIENT CORE AND HARD FACES ON EITHER SIDE. THE RETAINER FITS THROUGH ALIGNED HOLES IN THE TOP AND BOTTOM OF THE HOLDER AND BETWEEN THE PRONGS. BUTTRESS-TYPE PROJECTIONS ON THE FACING EDGES OF THE PRONGS ARE ENGAGED BY THE RETAINER TO PREVENT WITHDRAWAL OF THE TOOTH WHILE THE RETAINER IS IN POSITION. THE SHAPE OF THE PROJECTIONS PERMITS THE TOOTH TO BE DRIVEN INTO PLACE WHILE THE RETAINER IS IN PLACE IN THE HOLDER.
Inventors
- 👤 Walter L Sturgeon
Bibliographic Details
Claims Analysis
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |