Patent US2239860A successfully refreshed from Google Patents.
US2239860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making plastic products
Assignee: United States Gypsum Co
•
Filing: 1937-04-28
•
Granted: 1941-04-29
•
Expires: 1957-04-28
Abstract
No abstract record available.
Inventors
- 👤 Carlisle K Roos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:47
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; B; B28; B28B; B28B19/00; B28B19/0092; E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
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) | 1944-04-28 | 1944-10-28 | 1945-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-28 | 1948-10-28 | 1949-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-28 | 1952-10-28 | 1953-04-29 | $7700.00 | Window Closed / Lapsed |