US3214640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power fluctuation protection apparatus
Assignee: WR Grace and Co
•
Filing: 1965-01-14
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Granted: 1965-10-26
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Expires: 1985-01-14
Abstract
No abstract record available.
Inventors
- 👤 Charles W Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:06
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/0007; H02H3/00; H02H3/24; H02H3/247
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN A RAPID-ACTING SYSTEM FOR PROTECTING ELECTRICAL APPARATUS AGAINST FLUCTUATIONS IN ITS ALTERNATING ELECTRIC SUPPLY, IN COMBINATION, A FAST-RESPONSE LAMP CONNECTED TO SAID ELECTRIC POWER SUPPLY AND EMITTING PULSES OF LIGHT OF INTENSITY AND FREQUENCY RELATED TO THE AMPLITUDE AND ALTERATIONS IN SAID SUPPLY, A LIGHT-SENSING MEANS INCLUDING A PHOTOSENSITIVE DEVICE POSITIONED TO RESPOND TO LIGHT FROM SAID LAMP AND ADAPTED TO GENERATE A PULSATING SIGNAL RELATED TO THE WAVEFORM THEREOF, A CONTROL DEVICE HAVING A FIRST STATE AND A SECOND STATE, MEANS INCLUDING A WAVEFORM-SENSING CIRCUIT CONNECTED TO RECEIVE SAID
Claim 2
Dependent Claim
91 words
IN A RAPID-ACTING SYSTEM FOR PROTECTING ELECTRICAL APPARATUS AGAINST FLUCTUATIONS IN ITS ALTERNATING ELECTRIC SUPPLY, IN COMBINATION, A FAST-RESPONSE LAMP CONNECTED TO SAID ELECTRIC POWER SUPPLY AND EMITTING PULSES OF LIGHT OF INTENSITY AND FREQUENCY RELATED TO THE AMPLITUDE AND ALTERATIONS IN SAID SUPPLY, A LIGHT-SENSING MEANS INCLUDING A PHOTOSENSITIVE DEVICE POSITIONED TO RESPOND TO LIGHT FROM SAID LAMP AND ADAPTED TO GENERATE A PULSATING SIGNAL RELATED TO THE WAVEFORM THEREOF, A CONTROL DEVICE HAVING A FIRST STATE AND A SECOND STATE, MEANS INCLUDING A WAVEFORM-SENSING CIRCUIT CONNECTED TO RECEIVE SAID
References Cited (Backward Citations)
US3004174A
Cited
US3029423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |