Patent US2979476A successfully refreshed from Google Patents.
US2979476A
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US
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Method of blending polystyrene and wax
Assignee: Foster Grant Co Inc
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Filing: 1958-03-19
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Granted: 1961-04-11
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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 22:30
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.
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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) | 1964-04-10 | 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 |