US3538203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of expandable and cellular resin products
Assignee: Shell USA Inc
•
Filing: 1968-07-10
•
Granted: 1970-11-03
•
Expires: 1988-07-10
Abstract
No abstract record available.
Inventors
- 👤 Robert H Overcashier
- 👤 Arthur L Fricke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; C; C08; C08J; C08J9/00; C08J9/04
Claims Analysis
Total Claims: 0
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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) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |