US2680697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Art of cleansing lens mounting blocks
Assignee: O W COBURN
•
Filing: 1953-03-04
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Granted: 1954-06-08
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Expires: 1973-03-04
Abstract
No abstract record available.
Inventors
- 👤 Fred G Fritzsche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:24
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
THE METHOD OF CLEANSING PITCH LADEN LENS MOUNTING BLOCKS, WHICH COMPRISES, PLACING THE BLOCKS IN INVERTED POSITION UPON A PERFORATED DECK, GENTLY HEATING THE BLOCKS TO MELT THE EXCESS PITCH AND TO CAUSE THE MOLTEN PITCH TO GRAVITATE THROUGH THE PERFORATIONS OF THE DECK, AND FINALLY IMMERSING THE BLOCKS IN A PITCH SOLVENT TO REMOVE THE RESIDUAL FILMS OF PITCH THEREFROM.
Claim 2
Independent Claim
61 words
THE METHOD OF CLEANSING PITCH LADEN LENS MOUNTING BLOCKS, WHICH COMPRISES, PLACING THE BLOCKS IN INVERTED POSITION UPON A PERFORATED DECK, GENTLY HEATING THE BLOCKS TO MELT THE EXCESS PITCH AND TO CAUSE THE MOLTEN PITCH TO GRAVITATE THROUGH THE PERFORATIONS OF THE DECK, AND FINALLY IMMERSING THE BLOCKS IN A PITCH SOLVENT TO REMOVE THE RESIDUAL FILMS OF PITCH THEREFROM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |