US2976428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital system of mechanically and electrically compatible building blocks
Assignee: Avco Manufacturing Corp
•
Filing: 1957-04-04
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Granted: 1961-03-21
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Expires: 1977-04-04
Abstract
No abstract record available.
Inventors
- 👤 Douglas F Parkhill
- 👤 Donald C Redpath
- 👤 Thaddeus C Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:55
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/027; H03K3/037; H03K3/0377; H03K19/00; H03K19/02; H03K19/173; H03K19/20; H03K19/21; H03K19/212; H03K3/033; H03K3/26; H03K3/28; H03K3/281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2712065A
Cited
US2629834A
Cited
US2670445A
Cited
US2676271A
Cited
US2890353A
Cited
US2874313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |