Patent US3011401A successfully refreshed from Google Patents.
US3011401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical objective
Assignee: Bell and Howell Co
•
Filing: 1958-09-12
•
Granted: 1961-12-05
•
Expires: 1978-09-12
Abstract
No abstract record available.
Inventors
- 👤 Irving C Sandback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:03
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US660747A
Cited
DE403706C
Cited
DE440229C
Cited
US1540752A
Cited
US1580751A
Cited
GB299983A
Cited
GB320795A
Cited
US1888156A
Cited
GB372228A
Cited
US2559836A
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 |