US3126432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particles of thermoplastic polymer
Assignee: —
•
Filing: —
•
Granted: 1964-03-24
•
Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C44/3415; B29C44/3426; Y; Y10; Y10S; Y10S264/00; Y10S264/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR PRODUCING A GAS-EXPANDED, CELLULAR POLYSTYRENE BODY HAVING CLOSED CELLS, COMPRISING EXPANDING PARTICLES OF POLYSTYRENE HAVING A VAPORIZABLE LIQUID C4 TO C5 PARAFFIN HYDROCARBON INFLATING AGENT INCORPORATED THEREIN, WHEREBY DISCRETE EXPANDED PARTICLES OF REDUCED DENSITY ARE FORMED, AGING SAD PARTICLES AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND AMBIENT TEMPERATURE FOR ABOUT 1 TO 3 HOURS, SUBJECTING THE AGED PRE-EXPANDED PARTICLES TO SUPERATMOSPHERIC AIR PRESSURE OF ABOUT 2 TO 8 ATMOSPHERES FOR FROM 2 TO 8 HOURS WHILE MAINTAINING THE PARTICULATE STATE OF THE PARTICLES, RELEASING SAID SUPERATMOSPHERIC PRESSURE, AND WITHIN FIVE HOURS THEREOF CONVERTING SAID PARTICLES INTO SAID CELLULAR POLYSTYRENE ARTICLES BY HEATING IN A CLOSED MOLD.
Claim 2
Dependent Claim
107 words
A PROCESS FOR PRODUCING A GAS-EXPANDED, CELLULAR POLYSTYRENE BODY HAVING CLOSED CELLS, COMPRISING EXPANDING PARTICLES OF POLYSTYRENE HAVING A VAPORIZABLE LIQUID C4 TO C5 PARAFFIN HYDROCARBON INFLATING AGENT INCORPORATED THEREIN, WHEREBY DISCRETE EXPANDED PARTICLES OF REDUCED DENSITY ARE FORMED, AGING SAD PARTICLES AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND AMBIENT TEMPERATURE FOR ABOUT 1 TO 3 HOURS, SUBJECTING THE AGED PRE-EXPANDED PARTICLES TO SUPERATMOSPHERIC AIR PRESSURE OF ABOUT 2 TO 8 ATMOSPHERES FOR FROM 2 TO 8 HOURS WHILE MAINTAINING THE PARTICULATE STATE OF THE PARTICLES, RELEASING SAID SUPERATMOSPHERIC PRESSURE, AND WITHIN FIVE HOURS THEREOF CONVERTING SAID PARTICLES INTO SAID CELLULAR POLYSTYRENE ARTICLES BY HEATING IN A CLOSED MOLD.
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) | 1967-03-24 | 1967-09-23 | 1968-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-24 | 1971-09-23 | 1972-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-24 | 1975-09-23 | 1976-03-24 | $7700.00 | Window Closed / Lapsed |