US3459832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline polystyrene having activity as a polymerization catalyst
Assignee: Monsanto Co
•
Filing: 1960-05-25
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Granted: 1969-08-05
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Expires: 1980-05-25
Abstract
No abstract record available.
Inventors
- 👤 Roland J Kern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:37
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04; B; B32; B32B; B32B27/00; B32B27/32; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/10; C08L53/00; C08L53/02; C08L23/0869; Y; Y10; Y10S; Y10S525/00; Y10S525/94; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3112301A
Cited
DE487727C
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US2608555A
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US3175999A
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BE553720A
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US3029221A
Cited
US3031432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |