Patent US3306792A successfully refreshed from Google Patents.
Patent US3687593A successfully refreshed from Google Patents.
US3687593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternate projections in sealing member
Assignee: Phillips Petroleum Co
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Filing: 1971-01-04
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Granted: 1972-08-29
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Expires: 1991-01-04
Abstract
Abstract Parison sealing and severing members have small projections which aid in gripping a flattened end of the parison.
Inventors
- 👤 Dixie E Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:18
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/4802; B29C49/4817
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
182 words
A blow molding apparatus including a mold comprising in combination: a first mold half having a bottom wall forming surface and a severing edge offset from said wall forming surface and extending toward a center line of said mold; a second mold half having a bottom wall forming surface and a severing edge offset from said wall forming surface and extending toward said center line of said mold; said first and second mold halves having leading ends between their respective wall forming surfaces and severing edges so that in closed position said severing edges come into an abutting relationship and with said leading ends define a tab mold cavity; wherein said leading end of said first mold half has a plurality of projections which extend 50 to 90 percent of the distance between said leading ends in fully closed position; and, wherein said leading end of said second mold half has a plurality of projections alternating with said projections of said first mold half which projections extend 50 to 90 percent of the distance between said leading ends in fully closed position.
Claim 2
Dependent Claim
182 words
A blow molding apparatus including a mold comprising in combination: a first mold half having a bottom wall forming surface and a severing edge offset from said wall forming surface and extending toward a center line of said mold; a second mold half having a bottom wall forming surface and a severing edge offset from said wall forming surface and extending toward said center line of said mold; said first and second mold halves having leading ends between their respective wall forming surfaces and severing edges so that in closed position said severing edges come into an abutting relationship and with said leading ends define a tab mold cavity; wherein said leading end of said first mold half has a plurality of projections which extend 50 to 90 percent of the distance between said leading ends in fully closed position; and, wherein said leading end of said second mold half has a plurality of projections alternating with said projections of said first mold half which projections extend 50 to 90 percent of the distance between said leading ends in fully closed position.
Claim 3
Dependent Claim
28 words
Apparatus according to claim 1 wherein said distance between said leading ends of said first and second mold halves in fully closed position is 20 to 50 mils.
Claim 4
Dependent Claim
23 words
Apparatus according to claim 1 wherein a distance between said bottom wall forming surfaces and said severing edges is 20 to 140 mils.
Claim 5
Dependent Claim
14 words
Apparatus according claim 1 wherein said projections are in the form of round pins.
Claim 6
Dependent Claim
25 words
Apparatus according to claim 1 wherein said projections have a wedge shape with a flat bottom, parallel sides and a top sloping to a point.
Claim 7
Dependent Claim
34 words
Apparatus according to claim 1 wherein the included angle formed by surfaces extending away from said severing edges from the side away from the cavity is within the range of 30* to 47* .
Claim 8
Dependent Claim
28 words
Apparatus according to claim 1 wherein at least said severing edges of said mold halves are made of metal having a Rockwell C hardness of 59 to 61.
Claim 9
Dependent Claim
26 words
Apparatus according to claim 1 comprising in addition means to grip a parison at each end and means to effect relative movement between said gripping means.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |