US2533629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polystyrene plastic foam
Assignee: RCA Corp
•
Filing: 1945-04-18
•
Granted: 1950-12-12
•
Expires: 1965-04-18
Abstract
No abstract record available.
Inventors
- 👤 Rosenthal Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE METHOD OF PRODUCING A FOAM OF PLASTIC MATERIAL WHICH COMPRISES POLYMERIZING UNDER HEAT AND PRESSURE A SOLUTION OF ABOUT 90 PERCENT STYRENE AND ABOUT 10 PERCENT OF A MONO-OLEFIN HYDROCARBON HAVING NOT LESS THAN 4 NOR MORE THAN 6 CARBON ATOMS PER MOLECULE IN THE PRESA MATERIAL WHICH IS SOLUBLE IN SAID SOLUTION UNDER SAID PRESSURE AND WHICH IS ADAPTED TO GASIFY AT A RELATIVELY LOWER PRESSURE, AND THEN REDUCING SAID PRESSURE WHEREBY TO CAUSE SAID MATERIAL TO GASIFY AND EXPAND WHILE BEING ENTRAPPED IN SAID POLYMER, SAID EXPANDING, ENTRAPPED GAS CAUSING SAID POLYMER TO EXPAND INTO A CELLULAR STRUCTURE.
Claim 2
Independent Claim
101 words
THE METHOD OF PRODUCING A FOAM OF PLASTIC MATERIAL WHICH COMPRISES POLYMERIZING UNDER HEAT AND PRESSURE A SOLUTION OF ABOUT 90 PERCENT STYRENE AND ABOUT 10 PERCENT OF A MONO-OLEFIN HYDROCARBON HAVING NOT LESS THAN 4 NOR MORE THAN 6 CARBON ATOMS PER MOLECULE IN THE PRESA MATERIAL WHICH IS SOLUBLE IN SAID SOLUTION UNDER SAID PRESSURE AND WHICH IS ADAPTED TO GASIFY AT A RELATIVELY LOWER PRESSURE, AND THEN REDUCING SAID PRESSURE WHEREBY TO CAUSE SAID MATERIAL TO GASIFY AND EXPAND WHILE BEING ENTRAPPED IN SAID POLYMER, SAID EXPANDING, ENTRAPPED GAS CAUSING SAID POLYMER TO EXPAND INTO A CELLULAR STRUCTURE.
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |