Patent US3764043A successfully refreshed from Google Patents.
US3764043A
Expired / Lapsed
US
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Extrusion apparatus
Assignee: Dow Chemical Co
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Filing: 1970-12-10
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Granted: 1973-10-09
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Expires: 1990-12-10
Abstract
Abstract A lightweight plastics extruder is disclosed which can be used with particular benefit in the preparation of structures wherein a foamable plastic is extruded in a desired location and the extruder moved as foam material is deposited.
Inventors
- 👤 D Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:22
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B29C44/00; B29C44/34; B29C44/3442; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/78; B29C48/875; B29C48/92; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/45; B29C66/70; B29C66/72; B29C66/727; B29C66/80; B29C66/81; B29C66/816; B29C66/8161; B29C66/818; B29C66/8182; B29C66/81821; B29C66/82; B29C66/822; B29C66/8221; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91421; B29C66/93; B29C66/934; B29D; B29D25/00; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92019; B29C2948/92209; B29C2948/92323; B29C2948/92361; B29C2948/9238; B29C2948/924; B29C2948/92504; B29C2948/92514; B29C2948/92542; B29C2948/9258; B29C2948/92704; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92895; B29C48/03; B29K; B29K2105/00; B29K2105/04; B29L; B29L2031/00; B29L2031/10; B29L2031/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A screw extruder partIcularly adapted and suited for deposition of material on a fixed base or support, the extruder comprising in cooperative combination a barrel having a feed end and a discharge end, the barrel defining a generally cylindrical cavity, the barrel having a plurality of heating zones, each of the zones having means to inductively heat the zone and fluid heat transfer means associated therewith, an extrusion screw disposed within said cavity, means to rotate said screw at a variable rate, a pressure sensing means disposed adjacent said discharge end to sense the pressure of extruded material discharging from said cavity, a control means in operative association with said pressure sensing means and said means to rotate the screw to thereby maintain a generally constant output pressure.
Claim 2
Dependent Claim
128 words
A screw extruder partIcularly adapted and suited for deposition of material on a fixed base or support, the extruder comprising in cooperative combination a barrel having a feed end and a discharge end, the barrel defining a generally cylindrical cavity, the barrel having a plurality of heating zones, each of the zones having means to inductively heat the zone and fluid heat transfer means associated therewith, an extrusion screw disposed within said cavity, means to rotate said screw at a variable rate, a pressure sensing means disposed adjacent said discharge end to sense the pressure of extruded material discharging from said cavity, a control means in operative association with said pressure sensing means and said means to rotate the screw to thereby maintain a generally constant output pressure.
References Cited (Backward Citations)
No citation records indexed.
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 |