US3438693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatial filtering system utilizing reflection optics
Assignee: Shell USA Inc
•
Filing: 1965-04-29
•
Granted: 1969-04-15
•
Expires: 1985-04-29
Abstract
No abstract record available.
Inventors
- 👤 Samuel Pinckney Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:27
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/364; G02; G02B; G02B27/00; G02B27/42; G02B27/46; G06; G06E; G06E3/00; G06E3/001; G01V2210/00; G01V2210/20; G01V2210/27
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |