Patent US2990306A successfully refreshed from Google Patents.
US2990306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric sheet materials
Assignee: Imperial Chemical Industries Ltd
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Filing: 1957-06-17
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Granted: 1961-06-27
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Expires: 1977-06-17
Abstract
No abstract record available.
Inventors
- 👤 Dyer Ronald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
B; B32; B32B; B32B27/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A LAMINATED STRUCTURE OF A VINYL CHLORIDE POLYMERIC MATERIAL WHICH IS RESISTANT TO ULTRAVIOLET RADIATION DEGRADATION COMPRISING AN EXTERNAL LAMINA OF VINYL CHLORIDE POLYMERIC MATERIAL CONTAINING A SUBSTANCE WHICH ABSORBS ULTRAVIOLET RADIATION DISPERSED THERETHROUGH AND ANOTHER LAMINA FREE FROM SUBSTANCES ABSORBING ULTRAVIOLET RADIATION WHICH IS PROTECTED FROM DEGRADATION BY ULTRAVIOLET RADIATION BY THE FIRST LAMINA.
Claim 2
Dependent Claim
55 words
A LAMINATED STRUCTURE OF A VINYL CHLORIDE POLYMERIC MATERIAL WHICH IS RESISTANT TO ULTRAVIOLET RADIATION DEGRADATION COMPRISING AN EXTERNAL LAMINA OF VINYL CHLORIDE POLYMERIC MATERIAL CONTAINING A SUBSTANCE WHICH ABSORBS ULTRAVIOLET RADIATION DISPERSED THERETHROUGH AND ANOTHER LAMINA FREE FROM SUBSTANCES ABSORBING ULTRAVIOLET RADIATION WHICH IS PROTECTED FROM DEGRADATION BY ULTRAVIOLET RADIATION BY THE FIRST LAMINA.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |