US3492062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of fluids exhibiting an optical density change upon exposure to light
Assignee: Sierracin Corp
•
Filing: 1966-07-11
•
Granted: 1970-01-27
•
Expires: 1986-07-11
Abstract
No abstract record available.
Inventors
- 👤 Herbert Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:25
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/02; A61F9/022; A61F9/023; G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/23; G02C; G02C7/00; G02C7/10; G02C7/102
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1515389A
Cited
US2300251A
Cited
US2576581A
Cited
US2437642A
Cited
US3010109A
Cited
US3370902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |