US3380718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for molding high quality plastic lenses
Assignee: NEEFE HAMILTON RES CO
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Filing: 1964-07-20
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Granted: 1968-04-30
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Expires: 1984-07-20
Abstract
No abstract record available.
Inventors
- 👤 Charles W Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:08
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A PROCESS FOR MAKING HIGH QUALITY PLASTIC LENSES FROM A MONOMER AND TWO CATALYSTS, ONE HAVING A LOWER REACTION TEMPERATURE THAN THE OTHER AND EACH CAPABLE OF POLYMERIZING SAID MONOMER COMPRISING FILLING A CONCAVE MOLD WITH THE LIQUID MONOMER AND FLOATING A CONVEX MOLD UPON THE LIQUID MONOMER AND APPLYING PRESSURE TO THE CONVEX MOLD FORCING SAID CONVEX MOLD INTO THE LIQUID MONOMER WHEREBY THE DESIRED THICKNESS OF LIQUID MONOMER IS PRESENT BETWEEN THE MOLD SURFACES AND HEATING THE MONOMER TO ACTIVATE THE LOWER TEMPERATURE CATALYST UNTIL A GEL IS FORMED AND APPLYING ADDITIONAL PRESSURE TO THE CONVEX MOLD FORCING THE MOLD SURFACES AGAINST THE GEL MATERIAL AND INCREASING THE PRESSURE AS THE GEL THICKENS INTO A SOLID AND APPLYING ADDITIONAL HEAT TO ACTIVATE THE HIGHER TEMPERATURE CATALYST AND TO COMPLETE THE POLYMERIZATION.
Claim 2
Dependent Claim
133 words
A PROCESS FOR MAKING HIGH QUALITY PLASTIC LENSES FROM A MONOMER AND TWO CATALYSTS, ONE HAVING A LOWER REACTION TEMPERATURE THAN THE OTHER AND EACH CAPABLE OF POLYMERIZING SAID MONOMER COMPRISING FILLING A CONCAVE MOLD WITH THE LIQUID MONOMER AND FLOATING A CONVEX MOLD UPON THE LIQUID MONOMER AND APPLYING PRESSURE TO THE CONVEX MOLD FORCING SAID CONVEX MOLD INTO THE LIQUID MONOMER WHEREBY THE DESIRED THICKNESS OF LIQUID MONOMER IS PRESENT BETWEEN THE MOLD SURFACES AND HEATING THE MONOMER TO ACTIVATE THE LOWER TEMPERATURE CATALYST UNTIL A GEL IS FORMED AND APPLYING ADDITIONAL PRESSURE TO THE CONVEX MOLD FORCING THE MOLD SURFACES AGAINST THE GEL MATERIAL AND INCREASING THE PRESSURE AS THE GEL THICKENS INTO A SOLID AND APPLYING ADDITIONAL HEAT TO ACTIVATE THE HIGHER TEMPERATURE CATALYST AND TO COMPLETE THE POLYMERIZATION.
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |