US3833383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic recording medium
Assignee: RCA Corp
•
Filing: 1972-08-18
•
Granted: 1974-09-03
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Expires: 1992-08-18
Abstract
Abstract A holographic recording medium having a non-blocking antihalation layer comprising a hydrophilic polymer having unreacted vinyl alcohol groups and an antihalation dyestuff.
Inventors
- 👤 R Ryan
- 👤 L Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:17
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/835
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
A medium according to claim 1 wherein the vinyl alcohol polymer is a copolymer of vinyl alcohol and vinyl butyral.
Claim 2
Dependent Claim
19 words
A recording medium according to claim 1 wherein the support is a biaxially oriented optical quality polyethylene terephthalate film.
Claim 3
Dependent Claim
29 words
A medium according to claim 2 wherein the copolymer of vinyl alcohol and vinyl butyral contains about 20 percent by weight of the polymer of unreacted vinyl alcohol groups.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |