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US2956475A
Expired / Lapsed
US
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Wide angle lens attachment
Assignee: Bell and Howell Co
•
Filing: 1958-07-21
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Granted: 1960-10-18
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Expires: 1978-07-21
Abstract
No abstract record available.
Inventors
- 👤 Thomas I Harris
- 👤 Walter J Johnson
- 👤 Irving C Sandback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:01
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1934561A
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US1932082A
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US2263024A
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US2317790A
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US2324057A
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US2582085A
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US2811080A
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GB748910A
Cited
US2752821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |