Patent US3347838A successfully refreshed from Google Patents.
US3347838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers and articles
Assignee: Imperial Chemical Industries Ltd
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Filing: 1966-04-07
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Granted: 1967-10-17
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Expires: 1986-04-07
Abstract
No abstract record available.
Inventors
- 👤 Clark Keith Jasper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:36
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A MELT-SHAPED ARTICLE OF SUFFICIENT SECTIONAL THICKNESS TO BE RIGID COMPRISING A SOLID CRYSTALLINE POLYMER OF 4METHYL-PENTENE-1 HAVING AN ASH CONTENT OF LESS THAN 0,02% BY WEIGHT, A MELT FLOW INDEX (MEASURED BY ASTM METHOD 1238-57T USING A 5 KG. WEIGHT AT 260*C.) OF BETWEEN 0.01 AND 1000 AND A DENSITY OF 0.82 TO 0.86 GRAM PER CC. AND THE RECURRING STRUCTURAL UNIT -CH(-R)-CH2WHERE R STANDS FOR THE RADICAL -CH2-CH(-CH3)-CH3 SAID ARTICLE BEING FURTHER CHARACTERIZED BY HIGH CLARITY SUCH THAT WHEN EXPRESSED IN TERMS OF LOSS OF ANGULAR RESOLUTION THROUGH AN 1/8" SECTION THE LOSS DOES NOT EXCEED 0.0025* (SEMI-ANGLE), AND A LOW HAZE VALUE NOT EXCEEDING 15% WHEN THE INTENSITY OF LIGHT SCATTERED FROM 2 1/2 TO 90* TO THE INCIDENT BEAM THROUGH AN 1/8" SECTION IS INTEGRATED AND COMPARED WITH TOTAL TRANMITTANCE (0 TO 90*).
Claim 2
Dependent Claim
137 words
A MELT-SHAPED ARTICLE OF SUFFICIENT SECTIONAL THICKNESS TO BE RIGID COMPRISING A SOLID CRYSTALLINE POLYMER OF 4METHYL-PENTENE-1 HAVING AN ASH CONTENT OF LESS THAN 0,02% BY WEIGHT, A MELT FLOW INDEX (MEASURED BY ASTM METHOD 1238-57T USING A 5 KG. WEIGHT AT 260*C.) OF BETWEEN 0.01 AND 1000 AND A DENSITY OF 0.82 TO 0.86 GRAM PER CC. AND THE RECURRING STRUCTURAL UNIT -CH(-R)-CH2WHERE R STANDS FOR THE RADICAL -CH2-CH(-CH3)-CH3 SAID ARTICLE BEING FURTHER CHARACTERIZED BY HIGH CLARITY SUCH THAT WHEN EXPRESSED IN TERMS OF LOSS OF ANGULAR RESOLUTION THROUGH AN 1/8" SECTION THE LOSS DOES NOT EXCEED 0.0025* (SEMI-ANGLE), AND A LOW HAZE VALUE NOT EXCEEDING 15% WHEN THE INTENSITY OF LIGHT SCATTERED FROM 2 1/2 TO 90* TO THE INCIDENT BEAM THROUGH AN 1/8" SECTION IS INTEGRATED AND COMPARED WITH TOTAL TRANMITTANCE (0 TO 90*).
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |