US2960015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for making circular variable density filters
Assignee: Raytheon Co
•
Filing: 1956-09-24
•
Granted: 1960-11-15
•
Expires: 1976-09-24
Abstract
No abstract record available.
Inventors
- 👤 Milward T Rodine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:35
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/02; G02; G02B; G02B5/00; G02B5/20; G02B5/205
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1513322A
Cited
US2830491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-15 | 1964-05-16 | 1964-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-15 | 1968-05-16 | 1968-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-15 | 1972-05-16 | 1972-11-15 | $7700.00 | Window Closed / Lapsed |