Patent US3286135A successfully refreshed from Google Patents.
US3286135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Timing circuit
Assignee: Robotron Corp
•
Filing: 1964-01-30
•
Granted: 1966-11-15
•
Expires: 1984-01-30
Abstract
No abstract record available.
Inventors
- 👤 Richard E Haver
- 👤 Frederick K Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:41
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/25; B23K11/251; H; H03; H03K; H03K17/00; H03K17/28; H03K17/292
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A WELDING TIMER FOR TIMING A PRECISE NUMBER OF CYCLES OF AN ALTERNATING VOLTAGE SOURCE, THE COMBINATION COMPRISING: A FIRST VALVE; DIRECT CURRENT SOURCE MEANS FOR SUPPLYINNG A POSITIVE D.C. POTENTIAL TO THE ANODE MEMBER OF SAID FIRST VALVE; MEANS SUPPLYING VOLTAGE IN PHASE WITH SAID SOURCE VOLTAGE TO THE CONTROL MEMBER OF SAID FIRST VALVE; AND CONNECTION MEANS CONNECTING THE CATHODE MEMBER OF SAID FIRST VALVE TO THE OTHER SIDE OF SAID DIRECT CURRENT SOURCE AT A PRESELECTED POINT IN THE WAVEFORM OF SAID ALTERNATING VOLTAGE, WHEREBY SAID FIRST VALVE BEGINS CONDUCTION AT A PRESELECTED POINT IN THE WAVEFORM OF SAID ALTERNATING VOLTAGE AND WHEREIN SAID FIRST VALVE CONDUCTS INTERMITTENTLY AT THE FREQUENCY OF THE VOLTAGE SOURCE FOR PRODUCING AN INTERMITTENT POSITIVE POTENTIAL ON THE ANODE MEMBER THEREOF.
Claim 2
Dependent Claim
130 words
IN A WELDING TIMER FOR TIMING A PRECISE NUMBER OF CYCLES OF AN ALTERNATING VOLTAGE SOURCE, THE COMBINATION COMPRISING: A FIRST VALVE; DIRECT CURRENT SOURCE MEANS FOR SUPPLYINNG A POSITIVE D.C. POTENTIAL TO THE ANODE MEMBER OF SAID FIRST VALVE; MEANS SUPPLYING VOLTAGE IN PHASE WITH SAID SOURCE VOLTAGE TO THE CONTROL MEMBER OF SAID FIRST VALVE; AND CONNECTION MEANS CONNECTING THE CATHODE MEMBER OF SAID FIRST VALVE TO THE OTHER SIDE OF SAID DIRECT CURRENT SOURCE AT A PRESELECTED POINT IN THE WAVEFORM OF SAID ALTERNATING VOLTAGE, WHEREBY SAID FIRST VALVE BEGINS CONDUCTION AT A PRESELECTED POINT IN THE WAVEFORM OF SAID ALTERNATING VOLTAGE AND WHEREIN SAID FIRST VALVE CONDUCTS INTERMITTENTLY AT THE FREQUENCY OF THE VOLTAGE SOURCE FOR PRODUCING AN INTERMITTENT POSITIVE POTENTIAL ON THE ANODE MEMBER THEREOF.
References Cited (Backward Citations)
US2538881A
Cited
US3107320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |