US3440489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bidirectional switching means for electrical lamps
Assignee: Unisys Corp
•
Filing: 1966-10-21
•
Granted: 1969-04-22
•
Expires: 1986-10-21
Abstract
No abstract record available.
Inventors
- 👤 Ralph Davidson
- 👤 David R Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:46
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2823; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/725; H05; H05B; H05B39/00; H05B39/04; H05B39/08; H05B39/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
LAMP FLASHING APPARATUS COMPRISING: (A) POWER SUPPLY MEANS TO THE TYPE SUITABLE FOR CLASS A LOADS ADAPTED TO BE CONNECTED TO AN A.C. SOURCE FOR PROVIDING A D.C. VOLTAGE, (B) SYMMETRICAL ASTABLE MULTIVIBRATOR MEANS COUPLED TO SAID POWER SUPPLY MEANS AND RESPONSIVE TO SAID D.C. VOLTAGE FOR CYCLICALLY PROVIDING FIRST AND SECOND OUTPUT SIGNALS OF OPPOSITE STATES WITH RESPECT TO EACH OTHER, (C) FIRST AND SECOND GATED BIDIRECTIONAL SWITCHING MEANS HAVING FIRST AND SECOND GATING ELECTRODES RESPECTIVELY, AND ADAPTED TO CONTROL FIRST AND SECOND LAMP MEANS RESPECTIVELY; AND
Claim 2
Dependent Claim
88 words
LAMP FLASHING APPARATUS COMPRISING: (A) POWER SUPPLY MEANS TO THE TYPE SUITABLE FOR CLASS A LOADS ADAPTED TO BE CONNECTED TO AN A.C. SOURCE FOR PROVIDING A D.C. VOLTAGE, (B) SYMMETRICAL ASTABLE MULTIVIBRATOR MEANS COUPLED TO SAID POWER SUPPLY MEANS AND RESPONSIVE TO SAID D.C. VOLTAGE FOR CYCLICALLY PROVIDING FIRST AND SECOND OUTPUT SIGNALS OF OPPOSITE STATES WITH RESPECT TO EACH OTHER, (C) FIRST AND SECOND GATED BIDIRECTIONAL SWITCHING MEANS HAVING FIRST AND SECOND GATING ELECTRODES RESPECTIVELY, AND ADAPTED TO CONTROL FIRST AND SECOND LAMP MEANS RESPECTIVELY; 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) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |