US2071907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polymers in sheet or block form
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1935-01-15
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Granted: 1937-02-23
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Expires: 1955-01-15
Abstract
No abstract record available.
Inventors
- 👤 Tattersall Harold James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:06
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C39/00; B29C39/003; B29C39/22; B29C39/26; B29C39/265; B29C2791/00; B29C2791/001; B29C37/00; B29C37/005; B29K; B29K2033/00; B29K2033/04; B29K2033/12; B29K2105/00; B29K2105/0002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-02-23 | 1940-08-24 | 1941-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-02-23 | 1944-08-24 | 1945-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-02-23 | 1948-08-24 | 1949-02-23 | $7700.00 | Window Closed / Lapsed |