US3721446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking puzzle
Assignee: Individual
•
Filing: 1971-03-24
•
Granted: 1973-03-20
•
Expires: 1991-03-24
Abstract
Abstract A PUZZLE FORMED OF A PLURALITY OF INTERFITTING PIECES WHICH ARE INTERLOCKED WITH PINS. THE PINS ARE ATTACHED TO CORRESPONDING PUZZLE PIECES. EACH OF THE PINS HAVE PORTIONS FORMED WITH A NOTCH. THE PINS EXTEND THROUGH HOLES IN ONE OR MORE OF THE ADJACENT INTERFITTING PIECES AND LOCKING MEANS, SUCH AS OTHER PINS EXTEND THROUGH THE NOTCHES TO LOCK TOGETHER THE PINS AND THE PIECES TO WHICH THEY ARE ATTACHED. THE PUZZLE CAN BE UNLOCKED BY THE REMOVAL OF THE PIECES IN A DEFINITE SEQUENCE.
Inventors
- 👤 C Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:35
CPC Classifications
A; A63; A63H; A63H3/00; A63H3/16; A63F; A63F9/00; A63F9/06; A63F9/12; A63F9/1252; A63F2009/1256; A63F2009/126; A63F2009/1268; A63F2009/1272; A63F2009/128; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7153; Y10T70/7169
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |