US3594457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of press forming birefringent transparent polyethylene terephthalate sheets
Assignee: Polaroid Corp
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Filing: 1967-06-12
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Granted: 1971-07-20
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Expires: 1987-06-12
Abstract
Abstract THIS DISCLOSURE CONCERNS A PROCESS FOR PRESS-FORMING LENTICULAR OR PRISMATIC CONFIGURATIONS IN ONE SIDE OF A SHEET OF DIMENSIONALLY STABLE MATERIAL, SUCH AS A POLYETHYLENE TEREPHTHALATE COMPOSITION OF THE TYPE COMMONLY KNOWN AS MYLAR, AND THE IMPROVED OPTICAL DEVICE PRODUCED THEREBY.
Inventors
- 👤 Richard F Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:18
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00278; B29C; B29C59/00; B29C59/02; B29C59/022; B29C2791/00; B29C2791/001; B29K; B29K2067/00; B29K2995/00; B29K2995/0018; B29K2995/0026; B29K2995/0031; B29K2995/0032; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |