Patent US5205743A successfully refreshed from Google Patents.
US5205743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental treatment method
Assignee: Boliden Contech AB
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Filing: 1992-01-21
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Granted: 1993-04-27
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Expires: 2012-01-21
Abstract
Abstract The invention relates to a method of decreasing the risk of injury from mercury in conjunction with dental treatment. The invention is characterized by passing an effective air flow immediately outside the oral cavity in which the dental treatment is effected. The air flow, together with air removed by suction from the oral cavity when sucking saliva therefrom is passed through a first filter in which solid and liquid particles are extracted from the air flow. The air is then passed through a second filter which is capable of taking up essentially all of the mercury vapor present in the air. This filter is preferably a selenium filter.
Inventors
- 👤 Bjorn M. Ludvigsson
- 👤 Ulf D. L. Stromberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:55
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A method of reducing the risk of injury from mercury in conjunction with dental treatment comprising passing an air flow immediately outside an oral cavity in which the dental treatment is taking place; passing the air flow , together with air removed by suction from the oral cavity when removing saliva by suction during the dental treatment, through a first filter for extracting solid and liquid particles from said air flow; and passing the air flow through a second filter which comprises a selenium filter so that essentially all of the mercury vapor is adsorbed on the selenium filter.
Claim 2
Independent Claim
99 words
A method of reducing the risk of injury from mercury in conjunction with dental treatment comprising passing an air flow immediately outside an oral cavity in which the dental treatment is taking place; passing the air flow , together with air removed by suction from the oral cavity when removing saliva by suction during the dental treatment, through a first filter for extracting solid and liquid particles from said air flow; and passing the air flow through a second filter which comprises a selenium filter so that essentially all of the mercury vapor is adsorbed on the selenium filter.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the air flow is heated prior to passing the air flow through the second filter.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein the air flow is from 500 to 2,000 liters per minute.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the air flow is dried prior to passing the air flow through the second filter.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein the air flow is from 500 to 2,000 liters per minute.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the air flow is from 500 to 2,000 liters per minute.
Claim 8
Independent Claim
99 words
A method of reducing the risk of injury from mercury in conjunction with dental treatment comprising passing an air flow immediately outside an oral cavity in which the dental treatment is taking place; passing the air flow, together with air removed by suction from the oral cavity when removing saliva by suction during the dental treatment, through a first filter for extracting solid and liquid particles from said air flow; drying or heating the air; and passing the air flow through a second filter which is capable of adsorbing essentially all of the mercury vapor in the air flow.
Claim 9
Independent Claim
99 words
A method of reducing the risk of injury from mercury in conjunction with dental treatment comprising passing an air flow immediately outside an oral cavity in which the dental treatment is taking place; passing the air flow, together with air removed by suction from the oral cavity when removing saliva by suction during the dental treatment, through a first filter for extracting solid and liquid particles from said air flow; drying or heating the air; and passing the air flow through a second filter which is capable of adsorbing essentially all of the mercury vapor in the air flow.
Claim 10
Dependent Claim
21 words
The method of claim 7 wherein the air flow is heated prior to passing the air flow through the second filter.
Claim 11
Dependent Claim
17 words
The method of claim 8 wherein the air flow is from 500 to 2,000 liters per minute.
Claim 12
Dependent Claim
21 words
The method of claim 7 wherein the air flow is dried prior to passing the air flow through the second filter.
Claim 13
Dependent Claim
17 words
The method of claim 10 wherein the air flow is from 500 to 2,000 liters per minute.
Claim 14
Dependent Claim
13 words
The method of claim 7 wherein the second filter is a selenium filter.
Claim 15
Dependent Claim
17 words
The method of claim 12 wherein the air flow is from 500 to 2,000 liters per minute.
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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) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |