US3248460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making lenses
Assignee: Bausch and Lomb Inc
•
Filing: 1963-02-28
•
Granted: 1966-04-26
•
Expires: 1983-02-28
Abstract
No abstract record available.
Inventors
- 👤 Andrius A Naujokas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:08
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/0048; B29D11/00528; B29D11/00028; B29D11/00413; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
THE METHOD OF FORMING COMPOSITE BIFOCAL LENS OF SUBSTANTIAL POWER COMPRISING, CASTING A BASE LENS OF A PLASTIC MATERIAL HAVING LIMITED CURVATURES ON THE MAJOR SURFACES OF THE LENS TO PRODUCE APPROXIMATELY HALF OF THE PREDETERMINED POWER DESIRED IN THE COMPOSITE LENS, CASTING A LENS PORTION OF ADDITIONAL PLASTIC MATERIAL INTERGRAL
Claim 2
Independent Claim
51 words
THE METHOD OF FORMING COMPOSITE BIFOCAL LENS OF SUBSTANTIAL POWER COMPRISING, CASTING A BASE LENS OF A PLASTIC MATERIAL HAVING LIMITED CURVATURES ON THE MAJOR SURFACES OF THE LENS TO PRODUCE APPROXIMATELY HALF OF THE PREDETERMINED POWER DESIRED IN THE COMPOSITE LENS, CASTING A LENS PORTION OF ADDITIONAL PLASTIC MATERIAL INTERGRAL
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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |