Patent US3011402A successfully refreshed from Google Patents.
US3011402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical objective
Assignee: Bell and Howell Co
•
Filing: 1958-12-08
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Granted: 1961-12-05
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Expires: 1978-12-08
Abstract
No abstract record available.
Inventors
- 👤 Walter J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:45
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US660747A
Cited
GB191022157A
Cited
DE403706C
Cited
US1739512A
Cited
US1540752A
Cited
GB372228A
Cited
US2003881A
Cited
US2343629A
Cited
GB626371A
Cited
US2601367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |