Patent US3152209A successfully refreshed from Google Patents.
US3152209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide angle lens attachment
Assignee: Bell and Howell Co
•
Filing: 1961-04-28
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Granted: 1964-10-06
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Expires: 1981-04-28
Abstract
No abstract record available.
Inventors
- 👤 Cox Arthur
- 👤 Walter J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:57
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/12; G02B15/00; G02B15/02; G02B15/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
IN A WIDE ANGLE ATTACHMENT, PROCEEDING FROM FRONT TO REAR, A FRONT MEMBER INCLUDING A NEGATIVE MENISCUS CEMENTED DOUBLET FRONT COMPONENT AND BICONCAVE SINGLET REAR COMPONENT, AND A POSITIVE REAR MEMBER CONSISTING OF A BICONVEX SINGLET COMPONENT, THE ATTACHMENT COMPLYING SUBSTANTIALLY WITH THE FOLLOWING INEQUALITIES:
Claim 2
Dependent Claim
45 words
IN A WIDE ANGLE ATTACHMENT, PROCEEDING FROM FRONT TO REAR, A FRONT MEMBER INCLUDING A NEGATIVE MENISCUS CEMENTED DOUBLET FRONT COMPONENT AND BICONCAVE SINGLET REAR COMPONENT, AND A POSITIVE REAR MEMBER CONSISTING OF A BICONVEX SINGLET COMPONENT, THE ATTACHMENT COMPLYING SUBSTANTIALLY WITH THE FOLLOWING INEQUALITIES:
References Cited (Backward Citations)
US2944464A
Cited
DE1103617B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |