US2822647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming bifocal lenses
Assignee: Younger Manufacturing Co
•
Filing: 1955-12-16
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Granted: 1958-02-11
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Expires: 1975-12-16
Abstract
No abstract record available.
Inventors
- 👤 Norman N Rips
- 👤 Rips Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:27
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/0012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1561107A
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US1563918A
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US1487715A
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US1569258A
Cited
US1738866A
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US2372535A
Cited
GB612828A
Cited
US2715803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |