US3764245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing light structural board of thermoplastic resin
Assignee: Individual
•
Filing: 1971-05-10
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Granted: 1973-10-09
•
Expires: 1991-05-10
Abstract
Abstract An apparatus is disclosed which is adapted to produce a light structural board of thermo plastic resin, consisting of a plurality of inside plate and inner and outer layers which are secured together through a number of spaced ribs or partitions which are integral with the outer layers.
Inventors
- 👤 F Miyamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:53
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/345; B29C48/03; B29C48/09; B29C48/11; B29C48/304; B29C48/305; B29C48/07; B29C48/08; B29C48/12; B29L; B29L2031/00; B29L2031/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
An apparatus as set forth in claim 1, in which said rib-forming elements are fast on opposed outer surfaces of said mandrel and include a plurality of teeth projecting into said spaced passageways between the die and mandrel and extending close to said slots in directions substantially perpendicular to the slots and to the outlet end of the discharge passageway in said mandrel.
Claim 2
Dependent Claim
84 words
An apparatus as set forth in claim 1, in which said rib-forming elements are fast on those surfaces of said mandrel which define said outlet of the discharge passageway in the mandrel, said rib-forming elements being formed with slots which are spaced apart from each other in a direction parallel to said slots at the outlet ends of said discharge passageways between the die and mandrel and which extend in directions substantially perpendicular to the slots at the outlet ends of the discharge passageways.
Claim 3
Dependent Claim
60 words
An apparatus as set forth in claim 1, further comprising stream-diverting means disposed within said elongated cavity in the die and located upstream of said mandrel for positively diverting into said discharge passageways on both sides of the mandrel a stream of heat-plastified thermoplastic resin delivered into said elongated cavity in the die through said inlet end of the die.
Claim 4
Dependent Claim
33 words
An apparatus as set forth in claim 4, in which said stream-diverting means comprise a wall portion forming part of said mandrel and having surfaces which are respectively curved toward said discharge passageways.
Claim 5
Dependent Claim
30 words
An apparatus as set forth in claim 1, further comprising adjusting means for adjusting spacings between the inner and outer surfaces of said die and mandrel, respectively, defining said slots.
Claim 6
Dependent Claim
25 words
An apparatus as set forth in claim 1, in which said at least one discharge passageway in said mandrel is enlarged toward its forward end.
Claim 7
Dependent Claim
36 words
An apparatus as set forth in claim 2, in which said teeth on one of said outer surfaces of the mandrel are substantially in alignment with the teeth on the other outer surface of the mandrel.
Claim 8
Dependent Claim
22 words
An apparatus as set forth in claim 2, in which said teeth project substantially perpendicularly from said outer surfaces of the mandrel.
Claim 9
Dependent Claim
21 words
An apparatus as set forth in claim 2, in which said teeth are inclined to said outer surfaces of the mandrel.
Claim 10
Dependent Claim
37 words
An apparatus as set forth in claim 2, in which said teeth on one of said outer surfaces of the mandrel are located in staggered relation to the teeth on the other outer surface of the mandrel.
Claim 11
Dependent Claim
34 words
An apparatus as set forth in claim 3, in which said slots formed by said rib-forming elements are substantially parallel to each other and are substantially normal to the inner surfaces of said die.
Claim 12
Dependent Claim
26 words
An apparatus as set forth in claim 3, in which said slots formed by said rib-forming elements are inclined to the inner surfaces of said die.
References Cited (Backward Citations)
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US3274315A
Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
US3557265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |