US3648965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasket for plastic casting
Assignee: PT OPERATING COMPANY Inc A CORP OF DE
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Filing: 1970-08-24
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Granted: 1972-03-14
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Expires: 1990-08-24
Abstract
Abstract A gasket for use in an apparatus for casting of acrylic plastic is shown. The permanent gasket seals a casting zone defined between two mold surfaces and includes a resilient inner core of plasticized polyvinyl chloride or silicone rubber having a durometer hardness between about 60 and 90 and a protective outer sheath around the inner core comprised of a thin layer of polyethylene or nylon.
Inventors
- 👤 Paul R Daddona
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:26
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/104
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
14 words
The gasket of claim 1, wherein the resilient inner core is plasticized polyvinyl chloride.
Claim 2
Dependent Claim
13 words
The gasket of claim 1, wherein the resilient inner core is silicone rubber.
Claim 3
Dependent Claim
11 words
The gasket of claim 1, wherein the outer sheath is nylon.
Claim 4
Dependent Claim
11 words
The gasket of claim 1, wherein the outer sheath is polyethylene.
Claim 5
Dependent Claim
11 words
The gasket of claim 1, wherein the outer sheath is ''''Teflon.''''
Claim 6
Dependent Claim
35 words
The gasket of claim 1, wherein said thin outer sheath is attached to said inner core by means of a locking channel located within said inner core, said channel having a laterally extended termination zone.
Claim 7
Dependent Claim
32 words
The gasket of claim 7, wherein two such channels, each terminated by a said laterally extended zone, are provideD in said inner core, said channels originating at the lower bottom corners thereof.
Claim 8
Dependent Claim
20 words
The gasket of claim 1, wherein the upper and lower corners of said gasket are extended beyond the sides thereof.
Claim 9
Dependent Claim
16 words
The gasket of claim 1, wherein said inner core is shaped as an inverted truncated triangle.
Claim 10
Dependent Claim
66 words
A gasket for use in sealing a casting zone for acrylic plastics, including the elements of: a resilient inner core comprised of plasticized polyvinyl chloride having a hardness of from 60 to 80 durometer; and a thin outer sheath comprised of nylon having a thickness varying from 0.005 to 0.015 inch, said thickness being greater at the face of said gasket than at the sides thereof.
Claim 11
Dependent Claim
66 words
A gasket for use in sealing a casting zone for acrylic plastics, including the elements of: a resilient inner core comprised of a silicone rubber having a hardness of from 70 to 90 durometer; and a thin outer sheath comprised of ''''Teflon'''' having a thickness varying from 0.003 to 0.008 inch, said thickness being greater at the face of said gasket than at the sides thereof.
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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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |