US2878174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene
Assignee: WR Grace and Co
•
Filing: 1955-06-06
•
Granted: 1959-03-17
•
Expires: 1975-06-06
Abstract
No abstract record available.
Inventors
- 👤 William C Rainer
- 👤 Edward M Redding
- 👤 Joseph J Hitov
- 👤 Arthur W Sloan
- 👤 William D Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:29
CPC Classifications
B; B29; B29C; B29C71/00; B29C71/04; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0844; B29C35/0866; B29C2035/0877; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2995/00; B29K2995/0018; B29K2995/0026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS COMPRISING HEATING POLYETHLENE TO AT LEAST ABOUT 105* C., IRRADIATING THE HOT POLYMER FOR A TIME SUFICIENT TO IMPACT A DOSAGE OF BETWEEN ABOUT 2X106 REP AND 200X10L REP TO OBTAIN A PRODUCT HAVING INCREASED PERMANENT TRANSPARENCY, SAID IRRADIATION BEING CARRIED OUT WITH HIGH ENERGY IRRADIATION EQUIVALENT TO AT LEAST 750,000 ELECTRON VOLTS, AND THEREAFTER COOLING THE IRRADIATED POLYMER.
Claim 2
Dependent Claim
61 words
A PROCESS COMPRISING HEATING POLYETHLENE TO AT LEAST ABOUT 105* C., IRRADIATING THE HOT POLYMER FOR A TIME SUFICIENT TO IMPACT A DOSAGE OF BETWEEN ABOUT 2X106 REP AND 200X10L REP TO OBTAIN A PRODUCT HAVING INCREASED PERMANENT TRANSPARENCY, SAID IRRADIATION BEING CARRIED OUT WITH HIGH ENERGY IRRADIATION EQUIVALENT TO AT LEAST 750,000 ELECTRON VOLTS, AND THEREAFTER COOLING THE IRRADIATED POLYMER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |