US2767067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal detwinning
Assignee: Individual
•
Filing: 1953-11-04
•
Granted: 1956-10-16
•
Expires: 1973-11-04
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Prichard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:41
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A METHOD OF TREATING A QUARTZ CRYSTAL OF SYMMETRICAL SHAPE CONTAINING DAUPHINE TWINNING TO PRODUCE A UNIFORM CRYSTALLINE STRUCTURE COMPRISING THE STEPS OF APPLYING A CONSTANT ALTERNATING CURRENT VOLTAGE OF VARIABLE FREQUENCY TO A DESIRED TWIN PORTION OF THE CRYSTAL WHILE SIMULTANEOUSLY GRADUALLY HEATING THE CRYSTAL TO A TEMPERATURE NEAR ITS HIGH-LOW IVERSION POINT, THE HEATING CAUSING BOTH AN INCREASE IN THE RESISTANCE AND A CHANGE IN THE RESONANT FREQUENCY OF THE CRYSTAL, CONTINUALLY ADJUSTING THE FREQUENCY OF THE APPLIED VOLTAGE DURING THE HEATING TO MAKE IT CORRESPOND SUBSTANTIALLY WITH THE CHANGING RESONANT FREQUENCY OF THE CRYSTAL, A TEMPERATURE AND A FREQUENCY BEING OBTAINED AT WHICH THE CURRENT PASSING THROUGH THE CRYSTAL IS SUBSTANTIALLY ZERO, APPLYING SAID VOLTAGE WITH SAID OBTAINED FREQUENCY AT SAID OBTAINED TEMPERATURE TO SAID CRYSTAL FOR A SHORT PERIOD OF SUCH DURATION AS TO INSURE THAT THE CRYSTAL HAS BEEN SUBJECTED TO THE FORCE REQUIRED FOR DETWINNING AND GRADUALLY COOLING SAID CRYSTAL.
Claim 2
Independent Claim
156 words
A METHOD OF TREATING A QUARTZ CRYSTAL OF SYMMETRICAL SHAPE CONTAINING DAUPHINE TWINNING TO PRODUCE A UNIFORM CRYSTALLINE STRUCTURE COMPRISING THE STEPS OF APPLYING A CONSTANT ALTERNATING CURRENT VOLTAGE OF VARIABLE FREQUENCY TO A DESIRED TWIN PORTION OF THE CRYSTAL WHILE SIMULTANEOUSLY GRADUALLY HEATING THE CRYSTAL TO A TEMPERATURE NEAR ITS HIGH-LOW IVERSION POINT, THE HEATING CAUSING BOTH AN INCREASE IN THE RESISTANCE AND A CHANGE IN THE RESONANT FREQUENCY OF THE CRYSTAL, CONTINUALLY ADJUSTING THE FREQUENCY OF THE APPLIED VOLTAGE DURING THE HEATING TO MAKE IT CORRESPOND SUBSTANTIALLY WITH THE CHANGING RESONANT FREQUENCY OF THE CRYSTAL, A TEMPERATURE AND A FREQUENCY BEING OBTAINED AT WHICH THE CURRENT PASSING THROUGH THE CRYSTAL IS SUBSTANTIALLY ZERO, APPLYING SAID VOLTAGE WITH SAID OBTAINED FREQUENCY AT SAID OBTAINED TEMPERATURE TO SAID CRYSTAL FOR A SHORT PERIOD OF SUCH DURATION AS TO INSURE THAT THE CRYSTAL HAS BEEN SUBJECTED TO THE FORCE REQUIRED FOR DETWINNING AND GRADUALLY COOLING SAID CRYSTAL.
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) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |