US4039310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of strengthening glass bottles and the like
Assignee: Duraglass Research and Development Corp
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Filing: 1976-01-12
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Granted: 1977-08-02
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Expires: 1996-01-12
Abstract
Abstract A method of strengthening glass comprising heating the glass to a temperature between approximately 700° F. and the decomposition temperature of a selected fatty acid, and applying said fatty acid to the surface of the glass. The fatty acid, in regard to the carboxyl group, employed in the disclosed process is not reacted with any other chemical; it is chemisorbed on the surface of the glass for strengthening the microcrack structure on said surface.
Inventors
- 👤 Nelson Eugene Sipe
- 👤 Noble Ida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:52
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
82 words
A method of strengthening glass against failure under tension, comprising a. heating the glass to a temperature between approximately 700° F. and the decomposition temperature of a given fatty acid, b. applying said given fatty acid to the surface of the glass, and c. slowly cooling the glass said fatty acid being substantially non reacted with any other chemical in regard to the carboxyl group and being cemisorbed on the surface of the glass for strengthening the microcrack structure on said surface.
Claim 2
Independent Claim
82 words
A method of strengthening glass against failure under tension, comprising a. heating the glass to a temperature between approximately 700° F. and the decomposition temperature of a given fatty acid, b. applying said given fatty acid to the surface of the glass, and c. slowly cooling the glass said fatty acid being substantially non reacted with any other chemical in regard to the carboxyl group and being cemisorbed on the surface of the glass for strengthening the microcrack structure on said surface.
Claim 3
Independent Claim
80 words
A method of strengthening glass against failure under tension, comprising a. heating the glass to a temperature between approximately 700° F. and 1600° F. (371° C. and 871° C.), b. applying a fatty acid to the surface of said glass, and c. slowly cooling the glass said fatty acid being substantially non reacted with any other chemical in regard to the carboxyl group and being cemisorbed on the surface of the glass for strengthening the microcrack structure on said surface.
Claim 4
Independent Claim
80 words
A method of strengthening glass against failure under tension, comprising a. heating the glass to a temperature between approximately 700° F. and 1600° F. (371° C. and 871° C.), b. applying a fatty acid to the surface of said glass, and c. slowly cooling the glass said fatty acid being substantially non reacted with any other chemical in regard to the carboxyl group and being cemisorbed on the surface of the glass for strengthening the microcrack structure on said surface.
Claim 5
Dependent Claim
19 words
The method of claim 2, wherein the glass is heated to a temperature between 900° F. and 1300° F.
Claim 6
Dependent Claim
19 words
The method of claim 2, wherein the glass is heated to a temperature between 1000° F. and 1300° F.
Claim 7
Dependent Claim
15 words
The method of claim 2, wherein the fatty acid is applied in an inert carrier.
Claim 8
Dependent Claim
14 words
The method of claim 5, wherein the inert carrier is a paraffin base wax.
Claim 9
Dependent Claim
11 words
The method of claim 5, wherein the inert carrier is beeswax.
Claim 10
Dependent Claim
23 words
The method of claim 2, wherein the fatty acid is applied to the glass while the glass is being shaped in a mold.
Claim 11
Dependent Claim
27 words
The method of claim 8, wherein the fatty acid is first applied to said mold and the glass is then shaped by the fatty acid coated mold.
Claim 12
Dependent Claim
17 words
The method of claim 2, wherein the fatty acid is applied by spraying it upon the glass.
Claim 13
Dependent Claim
20 words
The method of claim 2, further comprising applying a coating of surface protective material to the fatty acid treated glass.
Claim 14
Dependent Claim
13 words
The method of claim 11, wherein the surface protective material is a plastic.
Claim 15
Dependent Claim
12 words
The method of claim 2, wherein the fatty acid is behenic acid.
Claim 16
Dependent Claim
12 words
The method of claim 2, wherein the fatty acid is stearic acid.
Claim 17
Dependent Claim
12 words
The method of claim 2, wherein the fatty acid is glutamic acid.
Claim 18
Dependent Claim
23 words
The method of claim 2, wherein a plurality of fatty acids are applied to the surface of the glass in an inert carrier.
Claim 19
Dependent Claim
21 words
The method of claim 16, wherein the fatty acids applied are behenic and stearic acids and the inert carrier is beeswax.
Claim 20
Dependent Claim
12 words
The method of claim 2, wherein the glass is lime-soda (silicon) glass.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |