US4060421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined reversible aqueous colloidal dental impression material
Assignee: Individual
•
Filing: 1976-05-21
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Granted: 1977-11-29
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Expires: 1996-05-21
Abstract
Abstract A combined reversible aqueous colloidal dental impression material comprising powdery agar-agar, water soluble starch, silicone oil, potassium sulfate, borax, perfume, pigment antiseptic and water. A process for preparing a combined reversible colloidal dental impression material by which powdery agar-agar, water soluble starch, silicone oil potassium sulfate, borax, perfume antiseptic and pigment are admixed under heating and agitation in the presence of water and the obtained mixture is homogenized.
Inventors
- 👤 Ikuji Yoshikawa
- 👤 Yoshihisa Noro
- 👤 Junji Okaneya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:10
CPC Classifications
C; C08; C08L; C08L5/00; C08L5/12; A; A61; A61K; A61K6/00; A61K6/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A reversible aqueous colloidal dental impression material emplaceable about a tooth for making an impression thereof, and which effectively bonds to an alginate solidifying material placed therearound in a combined impression process, said reversible impression material comprising: respective quantities of water and agar-agar; minor amounts of silicone oil and potassium sulfate for minimizing the formation of rough skin when said impression material is in contact with dental plaster; and a minor amount of water soluble starch sufficient for causing effective bonding between said impression material and said alginate solidifying material in a combined impression process.
Claim 2
Dependent Claim
95 words
A reversible aqueous colloidal dental impression material emplaceable about a tooth for making an impression thereof, and which effectively bonds to an alginate solidifying material placed therearound in a combined impression process, said reversible impression material comprising: respective quantities of water and agar-agar; minor amounts of silicone oil and potassium sulfate for minimizing the formation of rough skin when said impression material is in contact with dental plaster; and a minor amount of water soluble starch sufficient for causing effective bonding between said impression material and said alginate solidifying material in a combined impression process.
Claim 3
Dependent Claim
24 words
The dental impression material as set forth in claim 1 wherein said starch is present at a level of from about 1.0 to 2.0%.
Claim 4
Dependent Claim
24 words
The dental impression material as set forth in claim 1 including a quantity of borax for increasing the gel strength of said impression material.
Claim 5
Dependent Claim
81 words
The dental impression material as set forth in claim 1 wherein said agar-agar is present at a level of from about 8.5 to 14.0%, said water is present at a level of from about 79.9 to 88.3%, said silicone oil is present at a level of from about 0.3 to 1.0%, said potassium sulfate is present at a level of from about 1.5 to 2.0%, and said water soluble starch is present at a level of from about 1.0 to 2.0%.
Claim 6
Independent Claim
97 words
A method of preparing a reversible aqueous colloidal dental impression material emplaceable about a tooth for making an impression thereof, and which effectively bonds to an alginate solidifying material placed therearound in a combined impression process, said method comprising the steps of: admixing and heating together respective quantities of water, agar-agar, minor quantities of silicone oil and potassium sulfate, and a minor amount of water soluble starch sufficient for causing effective bonding between said impression material and said solidifying material in a combined impression process, in order to form a sol-state viscous mass; and homogenizing said mass.
Claim 7
Independent Claim
97 words
A method of preparing a reversible aqueous colloidal dental impression material emplaceable about a tooth for making an impression thereof, and which effectively bonds to an alginate solidifying material placed therearound in a combined impression process, said method comprising the steps of: admixing and heating together respective quantities of water, agar-agar, minor quantities of silicone oil and potassium sulfate, and a minor amount of water soluble starch sufficient for causing effective bonding between said impression material and said solidifying material in a combined impression process, in order to form a sol-state viscous mass; and homogenizing said mass.
Claim 8
Dependent Claim
20 words
The method as set forth in claim 5 including the step of cooling said homogenized mass to the solid state.
Claim 9
Dependent Claim
79 words
The method as set forth in claim 5 wherein said agar-agar is present at a level of from about 8.5 to 14.0%, said water is present at a level of from about 79.9 to 88.3%, said silicone oil is present at a level of from about 0.3 to 1.0%, said potassium sulfate is present at a level of from about 1.5 to 2.0%, and said water soluble starch is present at a level of from about 1.0 to 2.0%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |