Patent US3808750A successfully refreshed from Google Patents.
US3808750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental model trimmer
Assignee: Individual
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Filing: 1972-10-10
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Granted: 1974-05-07
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Expires: 1992-10-10
Abstract
Abstract A trimmer for dental models made of plaster or similar material, said trimmer being a self-contained, portable unit having a vacuum system to remove the dust of the trimmed material, said vacuum system including a filter, in bag form, supported within a scraping ring such that there is a comparatively large usable filtering surface. This surface is also readily scraped and thereby maintained effective. For both these and other reasons, the within trimmer requires minimum maintenance during prolonged intervals of use.
Inventors
- 👤 D Mann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:13
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/12; B; B24; B24B; B24B55/00; B24B55/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A dental model trimmer comprising, in combination, a motoroperated grinding wheel, a housing bounding a grinding chamber about said grinding wheel, an access opening into said grinding chamber for positioning a grindable dental model in grinding relation to said grinding wheel, and a dust removal means located in depending relation to said grinding wheel in said grinding chamber, said means comprising a vacuum source inlet, an elongated porous structure cylindrical in shape and having a free end extending in a clearance position from about said vacuum source inlet in covering relation over said vacuum source inlet, a dust filtering material in the form of a bag and having an operative position fitted over the free end of said cylindrical porous structure, and an operable means arranged to cause the removal of any dust which collects on said filter bag, said operable means including a handle which is accessible externally of said grinding chamber to facilitate dust-removal operation thereof and having a ring-like body of an oversized extent relative to said cylindrical porous structure, said ring being operatively arranged to partake of scraping movement along said filter bag in its supported position over said cylindrical porous structure.
Claim 2
Dependent Claim
196 words
A dental model trimmer comprising, in combination, a motoroperated grinding wheel, a housing bounding a grinding chamber about said grinding wheel, an access opening into said grinding chamber for positioning a grindable dental model in grinding relation to said grinding wheel, and a dust removal means located in depending relation to said grinding wheel in said grinding chamber, said means comprising a vacuum source inlet, an elongated porous structure cylindrical in shape and having a free end extending in a clearance position from about said vacuum source inlet in covering relation over said vacuum source inlet, a dust filtering material in the form of a bag and having an operative position fitted over the free end of said cylindrical porous structure, and an operable means arranged to cause the removal of any dust which collects on said filter bag, said operable means including a handle which is accessible externally of said grinding chamber to facilitate dust-removal operation thereof and having a ring-like body of an oversized extent relative to said cylindrical porous structure, said ring being operatively arranged to partake of scraping movement along said filter bag in its supported position over said cylindrical porous structure.
References Cited (Backward Citations)
DE423479C
Cited
GB191221462A
Cited
US1237793A
Cited
US2414056A
Cited
US2512930A
Cited
US2594456A
Cited
US2958164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |