Patent US2399859A successfully refreshed from Google Patents.
US4046578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Type of adhesive cement and certain improved products made possible thereby
Assignee: Individual
•
Filing: 1975-07-07
•
Granted: 1977-09-06
•
Expires: 1995-07-07
Abstract
Abstract New types of fast setting zinc oxide-polycarboxylic acid adhesive cements are disclosed as well as certain improved products the use of these cements makes possible.
Inventors
- 👤 David F. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:49
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
An intimate mixture of finely-divided, dry zinc oxide and a dry, solid, weak, powdered, unpolymerized polycarboxylic acid which acid is such as to rapidly wet and largely dissolve in water, said mixture being maintained dry and unreacted until use; its dry particles being bonded together by a dry, water-insoluble agent in the amount of the order of about 1-2% by anhydrous weight of the mix which bonding agent does not materially interfere with rapid wetting of said mixture when contacted with water and, when wetted, rapidly becomes adhesive and quickly sets to a strong, hard cement; the proportions of said oxide and said acid in said mixture being from 10 to 400 percent of their chemical equivalence, said cement being relatively resistant to distintegration in water when the proportion of said oxide is such as to be at least chemically equivalent to the acid in said mixture.
Claim 2
Dependent Claim
147 words
An intimate mixture of finely-divided, dry zinc oxide and a dry, solid, weak, powdered, unpolymerized polycarboxylic acid which acid is such as to rapidly wet and largely dissolve in water, said mixture being maintained dry and unreacted until use; its dry particles being bonded together by a dry, water-insoluble agent in the amount of the order of about 1-2% by anhydrous weight of the mix which bonding agent does not materially interfere with rapid wetting of said mixture when contacted with water and, when wetted, rapidly becomes adhesive and quickly sets to a strong, hard cement; the proportions of said oxide and said acid in said mixture being from 10 to 400 percent of their chemical equivalence, said cement being relatively resistant to distintegration in water when the proportion of said oxide is such as to be at least chemically equivalent to the acid in said mixture.
Claim 3
Dependent Claim
15 words
The product of claim 1 wherein the said zinc oxide has been inactivated by heating.
Claim 4
Dependent Claim
20 words
A dry mixture of the said zinc oxide and the said acid of claim 1, protected from absorption of moisture,
Claim 5
Dependent Claim
18 words
The product of claim 1 wherein the said zinc oxide has been inactivated by a thin hydrophobic coating.
Claim 6
Dependent Claim
12 words
The product of claim 1 wherein the said acid is citric acid.
Claim 7
Dependent Claim
35 words
The product of claim 5 wherein the said acid is citric acid and the said zinc oxide is in amount from 10 to 25 percent in excess of its chemical equivalent of said citric acid.
Claim 8
Dependent Claim
15 words
The product of claim 1 wherein the said zinc oxide is replaced by zinc carbonate.
Claim 9
Dependent Claim
31 words
The product of claim 1 wherein the said zinc oxide has been coated with about 0.5 percent of its weight of a hydrophobic zinc salt that slows its wetting with water.
Claim 10
Dependent Claim
55 words
The product of claim 1 wherein about 10 percent of the weight of the said zinc oxide has been replaced with at least one finely-divided, dry, inert material selected from the class consisting of MgO, Bi 2 O 3 , Ca 3 (PO 4 ) 2 , CaF 2 , silica, clay and diatomaceous earth.
Claim 11
Dependent Claim
34 words
The product of claim 1 wherein the said acid is selected from at least one of the acids in the class consisting of citric acid, carboxylated cellulose, malonic acid, malic acid, and maleic acid.
References Cited (Backward Citations)
US3607262A
Cited
US3882080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |