US3563869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Irradiated polyethylene
Assignee: WR Grace and Co
•
Filing: 1957-11-05
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Granted: 1971-02-16
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Expires: 1977-11-05
Abstract
Abstract 1. A PROCESS COMPRISING CROSS-LINKING POLYETHYLENE BY THE USE OF BOTH HIGH ENERGY IONIZING IRRADIATION AT A DOSAGE OF AT LEAST ABOUT 2X10**6 R.E.G. AND A FREE RADICAL POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF PEROXY COMPOUNDS, AZO COMPOUNDS AND POLYNITROSODIMETHYL TEREPHTHALATE.
Inventors
- 👤 William C Rainer
- 👤 Joseph J Hitov
- 👤 Edward M Redding
- 👤 Arthur W Sloan
- 👤 William D Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:32
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08J3/243; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08K5/04; C08K5/14; C08L2312/00; C08L2312/06; C08L67/00; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A PROCESS COMPRISING CROSS-LINKING POLYETHYLENE BY THE USE OF BOTH HIGH ENERGY IONIZING IRRADIATION AT A DOSAGE OF AT LEAST ABOUT 2X10**6 R.E.G. AND A FREE RADICAL POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF PEROXY COMPOUNDS, AZO COMPOUNDS AND POLYNITROSODIMETHYL TEREPHTHALATE.
Claim 2
Dependent Claim
42 words
A PROCESS COMPRISING CROSS-LINKING POLYETHYLENE BY THE USE OF BOTH HIGH ENERGY IONIZING IRRADIATION AT A DOSAGE OF AT LEAST ABOUT 2X10**6 R.E.G. AND A FREE RADICAL POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF PEROXY COMPOUNDS, AZO COMPOUNDS AND POLYNITROSODIMETHYL TEREPHTHALATE.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |