US2579138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polymeric materials in sheet form
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1949-01-13
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Granted: 1951-12-18
•
Expires: 1969-01-13
Abstract
No abstract record available.
Inventors
- 👤 Burness Alexander
- 👤 Williams Edmond George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:19
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C39/00; B29C39/003; B29C39/006; B29C48/00; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/9145; B29C48/9175; B29C48/03; B29C48/07; B29C48/08; B29L; B29L2007/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR THE PRODUCTION OF POLYMERIC MATERIALS IN SHEET FORM HAVING AT LEAST ONE SMOOTH SURFACE WHICH COMPRISES ALLOWING A MASS CONTAINING AT LEAST ONE LIQUID COMPOUND HAVING THE GROUP CH2=C< TO FLOW SO THAT IT FORMS A SMOOTH UPPER SURFACE UNDER GRAVITY AND IS SUBJECTED TO POLYMERIZATION PROMOTING MEANS WHEN IT IS BENEATH AN ADJACENT SURFACE HEATED TO A TEMPERATURE SUFFICIENT TO PREVENT CONDENSATION OF ANY COMPOUND VOLATILIZED FROM THE MASS.
Claim 2
Dependent Claim
73 words
A PROCESS FOR THE PRODUCTION OF POLYMERIC MATERIALS IN SHEET FORM HAVING AT LEAST ONE SMOOTH SURFACE WHICH COMPRISES ALLOWING A MASS CONTAINING AT LEAST ONE LIQUID COMPOUND HAVING THE GROUP CH2=C< TO FLOW SO THAT IT FORMS A SMOOTH UPPER SURFACE UNDER GRAVITY AND IS SUBJECTED TO POLYMERIZATION PROMOTING MEANS WHEN IT IS BENEATH AN ADJACENT SURFACE HEATED TO A TEMPERATURE SUFFICIENT TO PREVENT CONDENSATION OF ANY COMPOUND VOLATILIZED FROM THE MASS.
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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) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |