US2920987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic device
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1958-01-24
•
Granted: 1960-01-12
•
Expires: 1978-01-24
Abstract
No abstract record available.
Inventors
- 👤 Landry J Lionel
- 👤 Frederick G Sandholdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:20
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/02; A; A47; A47L; A47L13/00; A47L13/10; A47L13/40; A47L9/00; A47L9/02; A47L9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |