US2976550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grab-roll screen
Assignee: Silver Engineering Works Inc
•
Filing: 1956-07-23
•
Granted: 1961-03-28
•
Expires: 1976-07-23
Abstract
No abstract record available.
Inventors
- 👤 Harold F Silver
- 👤 Clarence R Steele
- 👤 James C Wright
- 👤 Frank B Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:13
CPC Classifications
A; A01; A01D; A01D33/00; A01D33/08; B; B07; B07B; B07B1/00; B07B1/12; B07B1/14; B07B1/15
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1346931A
Cited
US1766340A
Cited
US1899292A
Cited
US1895268A
Cited
US2244546A
Cited
US2357892A
Cited
US2565559A
Cited
US2479961A
Cited
US2670846A
Cited
US2604206A
Cited
US2624458A
Cited
US2618385A
Cited
FR1162833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |