US3928673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Release and lubricating composition for glass molds and method and apparatus utilizing such composition
Assignee: BALL PACKAGING PRODUCTS Inc A CORP OF
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Filing: 1973-08-16
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Granted: 1975-12-23
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Expires: 1993-08-16
Abstract
Abstract Release and lubricating composition for avoiding seizure between molten glass and metal molds for forming glass articles, for minimizing wear between mold sections and for improving the pack of glassware, comprising, a dispersion of graphite in a polyimide resin, molds having such composition coated thereon, and a method of applying the composition to molten glass contacting surfaces comprising dispersing the composition in a solvent, applying the dispersed composition to the glass contacting surface and then baking the coating at an elevated temperature.
Inventors
- 👤 Robert P Pardee
- 👤 Thomas J Loran
- 👤 Jr Archie L Bickling
- 👤 Richard E Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:26
CPC Classifications
C; C10; C10M; C10M7/00; C03; C03B; C03B40/00; C03B40/02; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K5/00; C08K5/0008; C08K5/0016; C10M2201/00; C10M2201/04; C10M2201/041; C10M2201/042; C10M2201/06; C10M2201/062; C10M2217/00; C10M2217/04; C10M2217/042; C10M2217/043; C10N; C10N2050/00; C10N2050/015; C10N2050/02; C10N2050/08; C10N2050/10; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
A METHOD OF FORMING A LUBRICATING AND RELEASE COATING ON METAL SURFACES WHICH COME INTO CONTACT WITH MOLTED GLASS FOR FORMING GLASS ARTICLES, COMPRISING: APPLYING A DISPERSION OF ABOUT 10% AND 90% BY WEIGHT BASED UPON THE SOLIDS A HIGH TEMPERATURE, POLYIMIDE-FORMING SYSTEM HAVING A REPEATING STRUCTURAL UNIT REPRESENTED BY THE FORMULA:
Claim 2
Independent Claim
52 words
A METHOD OF FORMING A LUBRICATING AND RELEASE COATING ON METAL SURFACES WHICH COME INTO CONTACT WITH MOLTED GLASS FOR FORMING GLASS ARTICLES, COMPRISING: APPLYING A DISPERSION OF ABOUT 10% AND 90% BY WEIGHT BASED UPON THE SOLIDS A HIGH TEMPERATURE, POLYIMIDE-FORMING SYSTEM HAVING A REPEATING STRUCTURAL UNIT REPRESENTED BY THE FORMULA:
Claim 3
Dependent Claim
42 words
A method set forth in claim 1, wherein the composition is heated at a temperature between about 575* to 700* F. for a period of between 5 minutes and 3 hours to form the high temperature, stable polymerized polyimide and graphite coating.
Claim 4
Dependent Claim
15 words
A method as set forth in claim 1, wherein the coating is burnished after heating.
Claim 5
Dependent Claim
19 words
A method as set forth in claim 1, wherein the coating is between about 0.00025 and 0.03 inch thick.
Claim 6
Independent Claim
51 words
A method of forming a lubricating and release coating on metal surfaces which come into contact with molten glass for the forming of glass articles, comprising: admixing between about 10% and 90% by weight based upon the solids of a polyimide-forming system having a repeating structurAl unit represented by the formula:
Claim 7
Independent Claim
51 words
A method of forming a lubricating and release coating on metal surfaces which come into contact with molten glass for the forming of glass articles, comprising: admixing between about 10% and 90% by weight based upon the solids of a polyimide-forming system having a repeating structurAl unit represented by the formula:
Claim 8
Dependent Claim
18 words
A method as set forth in claim 5, wherein the admixed solids are sprayed onto the glass-molding surface.
Claim 9
Dependent Claim
17 words
A method as set forth in claim 5, wherein the temperature stable coating is burnished after heating.
Claim 10
Dependent Claim
26 words
A method as set forth in claim 5, wherein the glass-molding surface is precleaned by abrasive blasting before the dispersed solids are applyed to the surface.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |