US3300623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal oven heating and control system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1959-05-27
•
Granted: 1967-01-24
•
Expires: 1979-05-27
Abstract
No abstract record available.
Inventors
- 👤 Gus J Smyrnos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:22
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A SYSTEM FOR MAINTAINING THE AMBIENT TEMPERATURE IN A CRYSTAL OVEN AT OR BELOW A PRESELECTED LEVEL COMPRISING, IN COMBINATION, A PRINCIPAL HEAT SOURCE WITH SAID OVEN, SAID HEAT SOURCE CONSISTING ESSENTIALLY OF CASCADED SWITCHING AND POWER TRANSISTORS BIASED FOR AMPLIFIER OPERATION, MEANS TO MAINTAIN THE EMITTER OF SAID POWER TRANSISTOR AT SUBSTANTIALLY CONSTANT POTENTIAL, MEANS TO SET THE SATURATION POINT OF SAID SWITCHING TRANSISTOR, AND MEANS INCLUDING THE LEAKAGE CURRENT FLOWING IN SAID SWITCHING TRANSISTOR RESPONSIVE TO THE TENDENCY OF THE TEMPERATURE IN OVEN TO EXCEED A PRESELECTED TEMPERATURE LEVEL TO DRIVE SAID SWITCHING TRANSISTOR TO CUT OFF THEREBY INTERRUPTING THE CURRENT FLOWING THROUGH THE TRANSISTOR HEAT SOURCE SYSTEM.
Claim 2
Independent Claim
110 words
A SYSTEM FOR MAINTAINING THE AMBIENT TEMPERATURE IN A CRYSTAL OVEN AT OR BELOW A PRESELECTED LEVEL COMPRISING, IN COMBINATION, A PRINCIPAL HEAT SOURCE WITH SAID OVEN, SAID HEAT SOURCE CONSISTING ESSENTIALLY OF CASCADED SWITCHING AND POWER TRANSISTORS BIASED FOR AMPLIFIER OPERATION, MEANS TO MAINTAIN THE EMITTER OF SAID POWER TRANSISTOR AT SUBSTANTIALLY CONSTANT POTENTIAL, MEANS TO SET THE SATURATION POINT OF SAID SWITCHING TRANSISTOR, AND MEANS INCLUDING THE LEAKAGE CURRENT FLOWING IN SAID SWITCHING TRANSISTOR RESPONSIVE TO THE TENDENCY OF THE TEMPERATURE IN OVEN TO EXCEED A PRESELECTED TEMPERATURE LEVEL TO DRIVE SAID SWITCHING TRANSISTOR TO CUT OFF THEREBY INTERRUPTING THE CURRENT FLOWING THROUGH THE TRANSISTOR HEAT SOURCE SYSTEM.
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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) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |