Patent US3320686A successfully refreshed from Google Patents.
US3320686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball drop
Assignee: Individual
•
Filing: 1964-12-04
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Granted: 1967-05-23
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Expires: 1984-12-04
Abstract
No abstract record available.
Inventors
- 👤 Walter L Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:27
CPC Classifications
G; G01; G01V; G01V7/00; G01V7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A BALL DROP INSTRUMENT COMPRISING: A MAGNETIZABLE BALL, A RELEASABLE SECURING MEANS FOR HOLDING AND RELEASING THE BALL, AND A CATCHER VERTICALLY SPACED BENEATH THE RELEASABLE SECURING MEANS FOR RECEIVING THE BALL WHEN RELEASED, THE RELEASABLE SECURING MEANS INCLUDING: AN ELONGATE BODY, A STATIONARY MEANS CONNECTED TO THE LOWER END OF THE BODY, A MAGNET SLIDABLY SUPPORTED BY THE BODY, HOLDING THE BALL AGAINST THE STATIONARY MEANS WHEN THE MAGNET IS POSITIONED ADJACENT THE STATIONARY MEANS, AND RELEASING THE BALL WHEN THE MAGNET IS MOVED AWAY FROM THE STATIONARY MEANS, AND
Claim 2
Dependent Claim
91 words
A BALL DROP INSTRUMENT COMPRISING: A MAGNETIZABLE BALL, A RELEASABLE SECURING MEANS FOR HOLDING AND RELEASING THE BALL, AND A CATCHER VERTICALLY SPACED BENEATH THE RELEASABLE SECURING MEANS FOR RECEIVING THE BALL WHEN RELEASED, THE RELEASABLE SECURING MEANS INCLUDING: AN ELONGATE BODY, A STATIONARY MEANS CONNECTED TO THE LOWER END OF THE BODY, A MAGNET SLIDABLY SUPPORTED BY THE BODY, HOLDING THE BALL AGAINST THE STATIONARY MEANS WHEN THE MAGNET IS POSITIONED ADJACENT THE STATIONARY MEANS, AND RELEASING THE BALL WHEN THE MAGNET IS MOVED AWAY FROM THE STATIONARY MEANS, AND
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) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |