US2979476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of blending polystyrene and wax
Assignee: Foster Grant Co Inc
•
Filing: 1958-03-19
•
Granted: 1961-04-11
•
Expires: 1978-03-19
Abstract
No abstract record available.
Inventors
- 👤 Richard B Bishop
- 👤 James S Pavlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:54
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L91/00; C08L91/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR PROVIDING A STABLE UNIFORM COMPOSITION OF POLYSTYRENE WITH UP TO 15% OF A WAX, COMPRISING HEATING STYRENE AND POLYMERIZATION CATALYST IN BULK TO A POLYMERIZATION CONVERSION OF 15% TO 60%, DISPERSING THE WAX IN THE POLYMERIZING MIX, AND THEN COMPLETING THE POLYMERIZATION IN THE SUBSTANTIAL ABSENCE OF AGITATION.
Claim 2
Dependent Claim
51 words
A PROCESS FOR PROVIDING A STABLE UNIFORM COMPOSITION OF POLYSTYRENE WITH UP TO 15% OF A WAX, COMPRISING HEATING STYRENE AND POLYMERIZATION CATALYST IN BULK TO A POLYMERIZATION CONVERSION OF 15% TO 60%, DISPERSING THE WAX IN THE POLYMERIZING MIX, AND THEN COMPLETING THE POLYMERIZATION IN THE SUBSTANTIAL ABSENCE OF AGITATION.
References Cited (Backward Citations)
US2127381A
Cited
US2353228A
Cited
US2681323A
Cited
US2588660A
Cited
US2670308A
Cited
US2752315A
Cited
US2750349A
Cited
US2779744A
Cited
US2830962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |