US3736082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam chamber
Assignee: BASF SE
•
Filing: 1971-11-26
•
Granted: 1973-05-29
•
Expires: 1991-11-26
Abstract
Abstract The steam chamber in an apparatus for the continuous manufacture of foamed polystyrene strands has perforated conveyor belts which are guided by rolls and which form, together with foam guides, a channel for the accommodation of particulate polystyrene which has been preformed but is capable of further expansion and which are positively and sealingly connected, via spacing strips, to two housing parts which encompass said channel.
Inventors
- 👤 K Wick
- 👤 N Holl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/206
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A steam chamber in an appratus for the continuous manufacture of foamed polystyrene webs, comprising the combination of the following features: perforated conveyor belts which are guided between rolls and which form, together with foam guides, a channel for the accommodation of particulate polystyrene which has been prefoamed but is capable of further expansion; spacing strips which are welded to said foam guides via connecting pieces; and two housing parts which are positively and sealingly conNected to said spacing strips by means of bolts and sealing elements, one of which housing parts has means for the introduction of steam and a condensate drain.
Claim 2
Dependent Claim
103 words
A steam chamber in an appratus for the continuous manufacture of foamed polystyrene webs, comprising the combination of the following features: perforated conveyor belts which are guided between rolls and which form, together with foam guides, a channel for the accommodation of particulate polystyrene which has been prefoamed but is capable of further expansion; spacing strips which are welded to said foam guides via connecting pieces; and two housing parts which are positively and sealingly conNected to said spacing strips by means of bolts and sealing elements, one of which housing parts has means for the introduction of steam and a condensate drain.
Claim 3
Dependent Claim
18 words
A steam chamber as claimed in claim 1, wherein the foam guides are covered with a polytetrafluoroethylene film.
Claim 4
Dependent Claim
18 words
A steam chamber as claimed in claim 1, wherein the steam is deflected and distributed by a baffle.
Claim 5
Dependent Claim
26 words
A steam chamber as claimed in claim 1, wherein the condensate forming in the upper half of the steam chamber is deflected by a guide plate.
Claim 6
Dependent Claim
25 words
A steam chamber as claimed in claim 1, wherein the seal between the conveyor belts and the housing parts is provided by metallic lip seals.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |