US2057548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing the adherence of stacked sheets
Assignee: Sylvania Industrial Corp
•
Filing: 1934-05-10
•
Granted: 1936-10-13
•
Expires: 1954-05-10
Abstract
No abstract record available.
Inventors
- 👤 Roger N Wallach
- 👤 Schwarz Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:06
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/58; B29C70/64; B29C37/00; B29C37/0067; B29C37/0071; B29K; B29K2001/00; B29K2001/08; B29K2001/12; B29K2995/00; B29K2995/0018; B29K2995/0026; Y; Y10; Y10S; Y10S118/00; Y10S118/01; Y10T; Y10T428/00; Y10T428/25; Y10T428/253
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) | 1939-10-13 | 1940-04-13 | 1940-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-10-13 | 1944-04-13 | 1944-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-10-13 | 1948-04-13 | 1948-10-13 | $7700.00 | Window Closed / Lapsed |