Patent US2858299A successfully refreshed from Google Patents.
US2858299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for pulverizing polyethylene
Assignee: Montedison SpA
•
Filing: 1954-03-16
•
Granted: 1958-10-28
•
Expires: 1974-03-16
Abstract
No abstract record available.
Inventors
- 👤 Guzzetta Giuseppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:12
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A THERMO-MECHANICAL PROCESS FOR REDUCING POLYETHYLENE TO A SMALL PARTICLES SIZE POWDER PASSING A SCREEN OF 200 MESH PER SQUARE CENTIMETER, WHICH COMPRISES SUBJECTING DRY POLYETHYLENE OF ANY PHYSICAL FORM LARGER THAN SAID SMALL PARTICLE SIZE POWDER TO MECHANICAL PRESSING FORCES SUFFICIENT TO ALTER SAID PHYSICAL FORM WHILE MAINTAINING THE POLYETHYLENE AT A TEMPERATURE BETWEEN 70 AND 105*C., AND CONTINUING SUBJECTING SAID POLYETHYLENE TO SAID MECHANICAL PRESSING FORCES AT SAID TEMPERATURE UNTIL IT CHANGES INTO A SOFT, FRIABLE MASS AND SAID MASS INTO A SMALL PARTICLE SIZE POWDER.
Claim 2
Dependent Claim
88 words
A THERMO-MECHANICAL PROCESS FOR REDUCING POLYETHYLENE TO A SMALL PARTICLES SIZE POWDER PASSING A SCREEN OF 200 MESH PER SQUARE CENTIMETER, WHICH COMPRISES SUBJECTING DRY POLYETHYLENE OF ANY PHYSICAL FORM LARGER THAN SAID SMALL PARTICLE SIZE POWDER TO MECHANICAL PRESSING FORCES SUFFICIENT TO ALTER SAID PHYSICAL FORM WHILE MAINTAINING THE POLYETHYLENE AT A TEMPERATURE BETWEEN 70 AND 105*C., AND CONTINUING SUBJECTING SAID POLYETHYLENE TO SAID MECHANICAL PRESSING FORCES AT SAID TEMPERATURE UNTIL IT CHANGES INTO A SOFT, FRIABLE MASS AND SAID MASS INTO A SMALL PARTICLE SIZE POWDER.
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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |