Patent US3428814A successfully refreshed from Google Patents.
US3428814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric system for measuring optical density
Assignee: Milton Roy LLC
•
Filing: 1965-05-26
•
Granted: 1969-02-18
•
Expires: 1985-05-26
Abstract
No abstract record available.
Inventors
- 👤 Douglas D Doonan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:53
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/447; G01N27/44704; G01N27/44717; G01N27/44721; G01N21/00; G01N21/17; G01N21/25; G01N21/27
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3096137A
Cited
US3031917A
Cited
US2995978A
Cited
US3102202A
Cited
US3076375A
Cited
US3226556A
Cited
US3320149A
Cited
US3346478A
Cited
US3208265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |