US2928130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for making cellular plastic products
Assignee: AT&T Inc
•
Filing: 1955-09-08
•
Granted: 1960-03-15
•
Expires: 1975-09-08
Abstract
No abstract record available.
Inventors
- 👤 Alvin N Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:18
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
THE METHOD OF PRODUCING CELLULAR POLYETHLENE ARTICLES, WHICH COMPRISES ADVANCING POLYETHYLENE THROUGH AN EXTRUSION APPARATUS BY THE ACTION OF A ROTATING EXTRUSION SCREW WHEREIN THE PRESSURE TO WHICH THE POLYETHLENE IS SUBJECTED FIRST INCREASES PROGRESSIVELY ABRUPTLY, AND FINALLY INCREASES PROGRESSIVELY, THEN DECREASES THE DISCHARGE END OF THE EXTRUSION APPARATUS, AND FORCING AN ELEMENTAL GAS SELECTED FROM THE GROUP CONSISTING OF NITROGEN, ARGON, NEON AND HELIUM INTO THE POLYETHYLENE STREAM IN THE EXTRUSION APPARATUS AT THE POINT WHERE THE PRESSURE THEREON DECREASES ABRUPTLY, WHEREBY THE GAS IS THROUGHLY ADMIXED WITH THE POLYETHLENE DURING THE FINAL INCREASE OF PRESSURE AND EXPANDS THE POLYETHYLENE INTO CELLAR FORM ON DISCHARGE FROM THE EXTRUSION APPARATUS.
Claim 2
Independent Claim
110 words
THE METHOD OF PRODUCING CELLULAR POLYETHLENE ARTICLES, WHICH COMPRISES ADVANCING POLYETHYLENE THROUGH AN EXTRUSION APPARATUS BY THE ACTION OF A ROTATING EXTRUSION SCREW WHEREIN THE PRESSURE TO WHICH THE POLYETHLENE IS SUBJECTED FIRST INCREASES PROGRESSIVELY ABRUPTLY, AND FINALLY INCREASES PROGRESSIVELY, THEN DECREASES THE DISCHARGE END OF THE EXTRUSION APPARATUS, AND FORCING AN ELEMENTAL GAS SELECTED FROM THE GROUP CONSISTING OF NITROGEN, ARGON, NEON AND HELIUM INTO THE POLYETHYLENE STREAM IN THE EXTRUSION APPARATUS AT THE POINT WHERE THE PRESSURE THEREON DECREASES ABRUPTLY, WHEREBY THE GAS IS THROUGHLY ADMIXED WITH THE POLYETHLENE DURING THE FINAL INCREASE OF PRESSURE AND EXPANDS THE POLYETHYLENE INTO CELLAR FORM ON DISCHARGE FROM THE EXTRUSION APPARATUS.
References Cited (Backward Citations)
US1156096A
Cited
US2515250A
Cited
US2669751A
Cited
US2622469A
Cited
US2719325A
Cited
FR1081583A
Cited
US2766481A
Cited
US2774105A
Cited
US2733051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |