US2904480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene
Assignee: WR Grace and Co
•
Filing: 1955-06-06
•
Granted: 1959-09-15
•
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 15:22
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; B; B29; B29C; B29C71/00; B29C71/04; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2995/00; B29K2995/0018; B29K2995/0026; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S8/00; Y10S8/09; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A PROCESS COMPRISING IRRADIATING POLYETHYLENE BELOW ABOUT 105* C. WITH HIGH ENERGY IRRADIATION EQUIVALENT TO AT LEAST ABOUT 750,000 ELECTRON VOLTS AT A DOSAGE OF AT LEAST ABOUT 2X106 REP UNTIL ITS DEFORMATION POINT IS SUBSTANTIALLY RAISED, THEN HEATING THE POLYETHYLENE TO THE POINT OF CLARITY AND TRANSPARENCY BUT BELOW THE NEW DEFORMATION POINT, THEN QUENCHING THE POLYETHYLENE TO DEVELOP LIMITED TRANSPARENCY, THEN FURTHER IRRADIATING THE POLYETHYLENE ABOUT 105* C. WITH HIGH ENERGY IRRADIATION EQUIVALENT TO AT LEAST ABOUT 750,000 ELECTRON VOLTS BELOW THE ORIGINAL DEFORMATION POINT TO FIX THE TRANSPARENCY, THEN HEATING THE IRRADIATED POLYETHYLENE TO AT LEAST ITS HOT CLEAR POINT AND FURTHER IRRADIATING SAID POLYETHYLENE ABOUT 105* C. WITH HIGH ENERGY IRRADIATION EQUIVALENT TO AT LEAST ABOUT 750,000 ELECTRON VOLTS WHILE AT THE ELEVATED TEMPERATURE, TO OBTAIN A FIXED HIGHER DEGREE OF CLARITY THE TOTAL IRRADIATION AFTER THE INITIAL IRRADIATION BEING BETWEEN 10X106 REP AND 100X106 REP AND THE TOTAL IRRADIATION FOR THE ENTIRE PROCESS NOT BEING OVER ABOUT 200X105 REP AND THEN PERMITTING THE FINALLY FIXED CLEAR POLYETHYLENE TO COOL.
Claim 2
Dependent Claim
174 words
A PROCESS COMPRISING IRRADIATING POLYETHYLENE BELOW ABOUT 105* C. WITH HIGH ENERGY IRRADIATION EQUIVALENT TO AT LEAST ABOUT 750,000 ELECTRON VOLTS AT A DOSAGE OF AT LEAST ABOUT 2X106 REP UNTIL ITS DEFORMATION POINT IS SUBSTANTIALLY RAISED, THEN HEATING THE POLYETHYLENE TO THE POINT OF CLARITY AND TRANSPARENCY BUT BELOW THE NEW DEFORMATION POINT, THEN QUENCHING THE POLYETHYLENE TO DEVELOP LIMITED TRANSPARENCY, THEN FURTHER IRRADIATING THE POLYETHYLENE ABOUT 105* C. WITH HIGH ENERGY IRRADIATION EQUIVALENT TO AT LEAST ABOUT 750,000 ELECTRON VOLTS BELOW THE ORIGINAL DEFORMATION POINT TO FIX THE TRANSPARENCY, THEN HEATING THE IRRADIATED POLYETHYLENE TO AT LEAST ITS HOT CLEAR POINT AND FURTHER IRRADIATING SAID POLYETHYLENE ABOUT 105* C. WITH HIGH ENERGY IRRADIATION EQUIVALENT TO AT LEAST ABOUT 750,000 ELECTRON VOLTS WHILE AT THE ELEVATED TEMPERATURE, TO OBTAIN A FIXED HIGHER DEGREE OF CLARITY THE TOTAL IRRADIATION AFTER THE INITIAL IRRADIATION BEING BETWEEN 10X106 REP AND 100X106 REP AND THE TOTAL IRRADIATION FOR THE ENTIRE PROCESS NOT BEING OVER ABOUT 200X105 REP AND THEN PERMITTING THE FINALLY FIXED CLEAR POLYETHYLENE TO COOL.
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |