US3317640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making curved optical and reflective surfaces
Assignee: Fortin Plastics Inc
•
Filing: 1964-06-22
•
Granted: 1967-05-02
•
Expires: 1984-06-22
Abstract
No abstract record available.
Inventors
- 👤 Harold A Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:53
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00605; B29D11/0073; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD FOR FORMING ELEMENTS OF THE CLASS DESCRIBED, WHICH COMPRISES: FORMING A BASE MOLD HAVING A MOLD SURFACE OF JPREDETERMINED CURVATURE: MOUNTING A RESILIENT, FINE-CELLED FOAM LAYER TO SAID MOLD SURFACE, SAID FOAM LAYER CONFORMING TO THE CURVATURE OF SAID MOLD SURFACE; HEATING A CAST SHEET OF PLASTIC MATERIAL, HAVING AT LEAST ONE OF ITS SURFACES GLASS-SMOOTH, TO A TEMPERATURE AT WHICH IT BECOMES FORMABLE, SAID FOAM LAYER HAVING A SOFTENING POINT ABOUT SAID TEMPERATURE; LAYING SAID HEATED FORMABLE JPLASTIC SHEET UPON SAID FOAM LAYER WITH SAID GLASS-SMOOTH SURFACE EXPOSED WHEREBY SAID PLASTIC SHEET CONFORMS SUBSTANTIALLY TO THE CURVATURE OF SAID MOLD SURFACE OF SAID BASE MOLD, CONFORMING A SECOND PLASTIC MATERIAL AGAINST SAID EXPOSED GLASS-SMOOTH SURFACE OF SAID PLASTIC SHEET, AND RELEASING SAID SECOND PLASTIC MATERIAL FROM SAID PLASTIC SHEET.
Claim 2
Independent Claim
132 words
A METHOD FOR FORMING ELEMENTS OF THE CLASS DESCRIBED, WHICH COMPRISES: FORMING A BASE MOLD HAVING A MOLD SURFACE OF JPREDETERMINED CURVATURE: MOUNTING A RESILIENT, FINE-CELLED FOAM LAYER TO SAID MOLD SURFACE, SAID FOAM LAYER CONFORMING TO THE CURVATURE OF SAID MOLD SURFACE; HEATING A CAST SHEET OF PLASTIC MATERIAL, HAVING AT LEAST ONE OF ITS SURFACES GLASS-SMOOTH, TO A TEMPERATURE AT WHICH IT BECOMES FORMABLE, SAID FOAM LAYER HAVING A SOFTENING POINT ABOUT SAID TEMPERATURE; LAYING SAID HEATED FORMABLE JPLASTIC SHEET UPON SAID FOAM LAYER WITH SAID GLASS-SMOOTH SURFACE EXPOSED WHEREBY SAID PLASTIC SHEET CONFORMS SUBSTANTIALLY TO THE CURVATURE OF SAID MOLD SURFACE OF SAID BASE MOLD, CONFORMING A SECOND PLASTIC MATERIAL AGAINST SAID EXPOSED GLASS-SMOOTH SURFACE OF SAID PLASTIC SHEET, AND RELEASING SAID SECOND PLASTIC MATERIAL FROM SAID PLASTIC SHEET.
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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |