Patent US2238730A successfully refreshed from Google Patents.
US2238730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sheets or films of artificial material
Assignee: WALTHER H DUISBERG
•
Filing: 1935-10-31
•
Granted: 1941-04-15
•
Expires: 1955-10-31
Abstract
No abstract record available.
Inventors
- 👤 Hauffe Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:04
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/24; B29C43/003; B29K; B29K2027/00; B29K2027/06; B29K2031/00; B29K2033/00; B29K2033/04; B29K2033/08; B29K2105/00; B29K2105/0085; B29K2105/0088; B29L; B29L2007/00; B29L2007/002; B29L2007/008
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1944-04-14 | 1944-10-14 | 1945-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-14 | 1948-10-14 | 1949-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-14 | 1952-10-14 | 1953-04-15 | $7700.00 | Window Closed / Lapsed |