US4046540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass injection moulding process
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1975-06-16
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Granted: 1977-09-06
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Expires: 1995-06-16
Abstract
Abstract The production of shaped glass articles is undertaken by an injection moulding process by charging a particulate inorganic glass having a transformation temperature of not greater than 300° C to an injection moulding machine; by converting the glass to a molten state in the barrel of the machine; and by injecting the molten glass into a mould on the machine.
Inventors
- 👤 Cyril John Lewis
- 👤 Neil Carter
- 👤 Neil Hunter Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:46
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/02; C03B19/025; B; B29; B29C; B29C45/00; C03C; C03C10/00; C03C10/0054; C03C3/00; C03C3/12; C03C3/16; C03C3/19
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A process for the production of shaped glass articles which comprises charging a particulate phosphate glass having a P 2 O 5 content of 25 mole % or greater having a transformation temperature of not greater than 300° C. to an injection moulding machine, converting the glass to the molten state in the barrel of the machine, the barrel temperature being in the range from the temperature at which the glass becomes molten up to a temperature of 600° C. injecting the molten glass into a mould on the machine, the temperature of the mould being maintained at a temperature in the range from the transformation temperature to 100° C. below the transformation of said glass; and removing the molded article from said mould.
Claim 2
Dependent Claim
124 words
A process for the production of shaped glass articles which comprises charging a particulate phosphate glass having a P 2 O 5 content of 25 mole % or greater having a transformation temperature of not greater than 300° C. to an injection moulding machine, converting the glass to the molten state in the barrel of the machine, the barrel temperature being in the range from the temperature at which the glass becomes molten up to a temperature of 600° C. injecting the molten glass into a mould on the machine, the temperature of the mould being maintained at a temperature in the range from the transformation temperature to 100° C. below the transformation of said glass; and removing the molded article from said mould.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1 in which the glass has a transformation temperature of not greater than 250° C.
Claim 4
Dependent Claim
16 words
A process as claimed in claim 1 in which the glass is an inorganic oxide glass.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1 in which the phosphate glass comprises at least 50 mole % of P 2 O 5 .
Claim 6
Dependent Claim
24 words
A process as claimed in claim 4 in which the phosphate glass comprises at least 60 mole % of P 2 O 5 .
Claim 7
Dependent Claim
42 words
A process as claimed in claim 1 in which at least part of the barrel of the injection moulding machine is at a temperature in the range 150° to 250° C. above the transformation temperature of the glass which is being moulded.
Claim 8
Dependent Claim
42 words
A process as claimed in claim 6 in which at least part of the barrel of the injection moulding machine is at a temperature in the range 150° to 200° C. above the transformation temperature of the glass which is being moulded.
Claim 9
Dependent Claim
18 words
The process of claim 1 which further includes the step of removing a shaped article from the mould.
References Cited (Backward Citations)
US1536821A
Cited
FR836962A
Cited
US3098699A
Cited
BE716365A
Cited
US3732181A
Cited
US3804645A
Cited
GB1371377A
Cited
GB1387301A
Cited
US3935018A
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 |