US3528749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring optical density
Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1966-12-09
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Granted: 1970-09-15
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Expires: 1986-12-09
Abstract
No abstract record available.
Inventors
- 👤 John Kent Bowker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:04
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01J; G01J1/00; G01J1/10; G01J1/16; G01J1/1626; H; H03; H03M; H03M1/00; H03M1/12; H03M1/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2167884A
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US2406716A
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US2994825A
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US3076375A
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US3060318A
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US3281828A
Cited
US3257897A
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US3287723A
Cited
US3413065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |