US3726624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam sheet material means
Assignee: Individual
•
Filing: 1970-02-27
•
Granted: 1973-04-10
•
Expires: 1990-02-27
Abstract
Abstract A urethane binder is used in a continuous process which employs metering and leveling devices to continuously form uniform density sheet materials from scrap foam particles. Novel uniform density, flame retardant, plastic foam sheets containing urethane binder are formed. A single application step is used simultaneously with formation of the foam sheet materials to incorporate at least one surfacing sheet of solid plastic on the foam sheet materials.
Inventors
- 👤 I Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:05
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; B29C67/00; B29C67/20; B29C67/207; B32B5/00; B32B5/18; B32B2266/00; B32B2266/02; B32B2266/0207; B32B2266/0214; B32B2266/0221; B32B2266/025; B32B2266/0278; Y; Y10; Y10S; Y10S264/00; Y10S264/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
An apparatus in accordance with claim 1 and further comprising means positioned between said leveling and spreading device and said reaction zone for detecting foreign objects in said mixture.
Claim 2
Dependent Claim
27 words
An apparatus in accordance with claim 1 wherein said leveling and spreading means comprises a means for forming a trough in a top surface of said mixture.
Claim 3
Dependent Claim
82 words
An apparatus in accordance with claim 1 wherein said means for receiving said foam particles and admixing said foam particles with the polyurethane resin binder comprise a first and second mixer arranged in series, and said metering means comprising an elongated shaft mounted for rotation in an open bottom trough, said elongated shaft carrying a plurality of blades so that the speed of rotation of said shaft determines the rate of flow of the particles and admixed binder from said admixing means.
Claim 4
Dependent Claim
31 words
An apparatus in accordance with claim 2 wherein said means for detecting foreign objects comprises a spring-loaded roller positioned adjacent a moving conveyor belt to sense pressure applied to said belt.
Claim 5
Dependent Claim
28 words
An apparatus in accordance with claim 3 wherein said leveling and spreading means comprise a rotatable axle carrying a plurality of axially extending blades having inturned edge portions.
Claim 6
Dependent Claim
57 words
An apparatus in accordance with the apparatus of claim 1 wherein said metering means comprises an elongated shaft mounted for rotation in an open bottom trough, said elongated shaft carrying a plurality of blades so that speed of rotation of said shaft determines the rate of flow of the particles and admixed binder from said admixing means.
Claim 7
Dependent Claim
26 words
An apparatus in accordance with claim 7 wherein said monitoring means is interconnected with said metering means to change the speed of rotation of said shaft.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |