US3719599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid lubricant composition and method of preparation
Assignee: Gruppo Lepetit SpA
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Filing: 1970-11-04
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Granted: 1973-03-06
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Expires: 1990-11-04
Abstract
Abstract A lubricating agent suitable for use in the preparation of water soluble tablets and a method of its preparation are disclosed. The agent comprises in combination a composition of substantially anhydrous sodium sulfate and a dimethylpolysiloxane.
Inventors
- 👤 G Crivellaro
- 👤 F Oldani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:47
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2095; A61K9/0002; A61K9/0007; A61K9/2004; A61K9/2022; A61K9/2031; A61K9/2036; A61K9/48; A61K9/50; C; C10; C10M; C10M111/00; C10M111/04; C10M2201/00; C10M2201/08; C10M2201/081; C10M2201/082; C10M2201/084; C10M2229/00; C10M2229/04; C10M2229/041; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A process for preparing a lubricating agent suitable for use as the sole essential lubricating agent in the preparation of water soluble tablets which comprises wetting a first ingredient consisting essentially of substantially anhydrous sodium sulfate with a second ingredient consisting essentially of a solution of a dimethylpolysiloxane in a volatile organic solvent, said dimethylpolysiloxane having a maximum viscosity of about 1,000 centistokes, the ratio of said dimethylpolysiloxane to said sodium sulfate ranging from about 2 to about 7 parts of dimethylpolysiloxane per 100 parts of sodium sulfate, and removing said volatile organic solvent.
Claim 2
Dependent Claim
94 words
A process for preparing a lubricating agent suitable for use as the sole essential lubricating agent in the preparation of water soluble tablets which comprises wetting a first ingredient consisting essentially of substantially anhydrous sodium sulfate with a second ingredient consisting essentially of a solution of a dimethylpolysiloxane in a volatile organic solvent, said dimethylpolysiloxane having a maximum viscosity of about 1,000 centistokes, the ratio of said dimethylpolysiloxane to said sodium sulfate ranging from about 2 to about 7 parts of dimethylpolysiloxane per 100 parts of sodium sulfate, and removing said volatile organic solvent.
Claim 3
Dependent Claim
16 words
A process as in claim 1, in which the volatile organic solvent is a halogenated hydrocarbon.
Claim 4
Dependent Claim
20 words
A process as in claims 1 and 2, in which the halogenated hydrocarbon is chloroform, methylene dichloride or carbon tetrachloride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |