Patent US4523261A successfully refreshed from Google Patents.
US4523261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light source, manually operated
Assignee: Individual
•
Filing: 1982-08-05
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Granted: 1985-06-11
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Expires: 2002-08-05
Abstract
Abstract A manually operated light source powered by one or more piezoelectric crystals, with supporting apparatus including hammer and anvil means to apply high impact pressure of 7,000 psi and more to the crystal so that a high impulse voltage of very short duration is produced, with means to transmit the voltage to gas filled discharge tube to produce light. The hammer and anvil may be driven by gravity or by mechanical means.
Inventors
- 👤 Philip G. West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:11
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/18; H02N2/183; H05; H05B; H05B47/00; H05B47/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A manually operated light source comprising: a cylinder containing at one end two or more piezoelectric crystals arranged with facing opposite polarities between a moveable metallic anvil and a first retaining anvil located at one end of the cylinder; said moveable anvil is circular in shape to conform in close tolerance with the interior wall of the cylinder; and, a gravity driven hammer slideably mounted within the cylinder for moving back and forth between the moveable anvil and a second retaining anvil located at the other end of the cylinder; said cylinder fitted with electrical connection means that connect positive and negative faces of the piezoelectric crystals to a gas-filled discharge tube, whereby the cylinder upon being rotated end for end allows the hammer to fall under force of gravity to strike the moveable anvil and cause the piezoelectric crystals to emit an electrical charge for intermittent lighting of the gas-filled tube.
Claim 2
Dependent Claim
152 words
A manually operated light source comprising: a cylinder containing at one end two or more piezoelectric crystals arranged with facing opposite polarities between a moveable metallic anvil and a first retaining anvil located at one end of the cylinder; said moveable anvil is circular in shape to conform in close tolerance with the interior wall of the cylinder; and, a gravity driven hammer slideably mounted within the cylinder for moving back and forth between the moveable anvil and a second retaining anvil located at the other end of the cylinder; said cylinder fitted with electrical connection means that connect positive and negative faces of the piezoelectric crystals to a gas-filled discharge tube, whereby the cylinder upon being rotated end for end allows the hammer to fall under force of gravity to strike the moveable anvil and cause the piezoelectric crystals to emit an electrical charge for intermittent lighting of the gas-filled tube.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |