Patent US3372215A successfully refreshed from Google Patents.
US3372215A
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US
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Production of expandable polymer particles
Assignee: Shell USA Inc
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Filing: 1966-03-16
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Granted: 1968-03-05
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Expires: 1986-03-16
Abstract
No abstract record available.
Inventors
- 👤 Leslie A Muirhead
- 👤 Edward L Hill
- 👤 Brian W Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:30
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/421; B29B7/428; B29B7/429; B29B7/74; B29B7/7404; B29B7/7409; B29B7/7414; B29B7/7433; B29B7/80; B29B7/82; B29B7/826; B29B7/88; B29B7/94; B29B9/00; B29B9/02; B29B9/06; B29B9/065; B29B9/12; B29C48/00; B29C48/001; B29C48/0022; B29C48/022; B29C48/03; B29C48/05; B29C48/25; B29C48/30; B29C48/345; B29C48/88; B29C48/911; B29C48/919; B29C48/92; C; C08; C08J; C08J9/00; C08J9/16; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92609; B29C2948/92619; B29C2948/92704; B29C2948/92819; B29C2948/92857; B29C2948/92904; B29C2948/92942; B29C2948/92971; B29C48/04; B29C48/90; B29C48/904; B29K; B29K2025/00; B29K2025/04; B29K2025/06; B29K2101/00; B29K2101/12; B29K2105/00; B29K2105/04; B29K2105/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB849935A
Cited
US3121132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |