US3502891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable reflectance memory device
Assignee: AT&T Inc
•
Filing: 1967-03-22
•
Granted: 1970-03-24
•
Expires: 1987-03-22
Abstract
No abstract record available.
Inventors
- 👤 Willard S Boyle
- 👤 Jack A Morton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:15
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/02; G02; G02F; G02F1/00; G02F1/01; G02F1/0126; G02F1/0147; G02F1/19; G09G3/04; G09G3/16; G09G3/20; G09G3/34; G11; G11C; G11C11/00; G11C11/21; G11C11/42; G11C13/00; G11C13/04; G11C13/048; G02F1/015; G02F1/0151
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3297878A
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US3092725A
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GB973341A
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US3039005A
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US3024140A
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US3183359A
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FR1334630A
Cited
US3322485A
Cited
US3295911A
Cited
US3305863A
Cited
US3323241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-23 | 1973-09-22 | 1974-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-23 | 1977-09-22 | 1978-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-23 | 1981-09-22 | 1982-03-24 | $7700.00 | Window Closed / Lapsed |