US3772061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Containers and methods of preparing
Assignee: Liberty Glass Co
•
Filing: 1971-10-14
•
Granted: 1973-11-13
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Expires: 1991-10-14
Abstract
Abstract A glass container having improved mechanical strength produced by coating the outside surface thereof with a composition containing a copolymer of acrylonitrile and ethyl acrylate, polyacrylamide and hexamethoxymethyl-melamine and curing said coating.
Inventors
- 👤 L Mccoy
- 👤 R Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:18
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/08; B; B65; B65D; B65D23/00; B65D23/08; B65D23/0807; B65D23/0814; C09D133/18; C09D133/20; C09D5/00; C09D5/04; C08; C08L; C08L33/00; C08L33/18; C08L33/20; C08L61/00; C08L61/20; Y; Y10; Y10S; Y10S215/00; Y10S215/06; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/1321; Y10T428/31504; Y10T428/31551; Y10T428/31645; Y10T428/31855; Y10T428/31909; Y10T428/31938
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A container as set forth in claim 1 having a layer of polyethylene adhered to the outside surface of said cured acrylic coating.
Claim 2
Independent Claim
127 words
A method of imparting improved mechanical strength to a glass container comprising the steps of: contacting the outside surface of said container with a thixotropic coating composition comprising a latex, said latex containing at least about 30 percent by weight of a rEsin comprising a copolymer of acrylonitrile and ethyl acrylate; between about 1.8 and about 7.5 parts by weight hexamethoxymethylmelamine per 100 parts by weight of said latex; and a sufficient proportion of polyacrylamide to impart to said composition a Brookfield viscosity of between about 2,000 and about 9,000 cps at 1 rpm and a Brookfield viscosity of between about 600 and 2,400 cps at 5 rpm; and curing said composition to provide a containment coating which increases the container''s resistance to both breakage and abrasion.
Claim 3
Dependent Claim
20 words
A method as set forth in claim 3, wherein the container is contacted with said coating composition by dipping therein.
Claim 4
Dependent Claim
37 words
A method as set forth in claim 3 wherein said coating composition is cured by raising it to a temperature of between about 350*F. and about 500*F. for a period of about 3 to about 30 minutes.
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |