US3864193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastic sheet having the appearance of stained glass
Assignee: National Teaching Aids Inc
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Filing: 1972-12-22
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Granted: 1975-02-04
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Expires: 1992-12-22
Abstract
Abstract There is disclosed a method for making a plastic sheet which has optical properties of stained glass. Dispersed throughout the base resin granules in an extruder hopper there are reground resin particles having a higher melting temperature. The extruder is operated at a temperature just at or slightly below the melting temperature of the reground particles. These particles are only partially melted and appear as random lumps and irregularities in the extruded sheet. The sheet is attached to a temporary semi-rigid backing after first forming a festoon and heating it to relax local stresses, and then combing it.
Inventors
- 👤 William Frierson
- 👤 Jerome Oberwager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:09
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/0026; B29B17/0042; B29C; B29C48/00; B29C48/022; B44; B44F; B44F1/00; B44F1/06; B44F1/063; B29C48/001; B29C48/0018; B29C48/0021; B29C48/0022; B29C48/0023; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/17; B29C48/18; B29C48/21; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2995/00; B29K2995/0037; B29K2995/0072; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24281; Y10T428/24289; Y10T428/24355
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
15 words
A plastic sheet in accordance with claim 1 wherein said particles are reground plastic material.
Claim 2
Dependent Claim
30 words
A plastic sheet in accordance with claim 1 wherein the volume of said particles is in the range one-fourth - one-half percent of the total volume of the plastic sheet.
Claim 3
Dependent Claim
27 words
A plastic sheet in accordance with claim 1 wherein said particles have a color which is different from the color of the base material of the sheet.
Claim 4
Dependent Claim
16 words
A plastic sheet in accordance with claim 1 wherein said sheet is a ''''cold'''' extruded sheet.
Claim 5
Dependent Claim
24 words
A plastic sheet in accordance with claim 5 wherein some of said particles extend through said sheet from one surface thereof to the other.
Claim 6
Dependent Claim
24 words
A plastic sheet in accordance with claim 1 wherein some of said particles extend through said sheet from the surface thereof to the other.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |