US3022570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum deposited strain gage and method of making same
Assignee: Individual
•
Filing: 1959-09-21
•
Granted: 1962-02-27
•
Expires: 1979-09-21
Abstract
No abstract record available.
Inventors
- 👤 Dudley D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:43
CPC Classifications
G; G03; G03F; G03F7/00; H; H01; H01C; H01C10/00; H01C10/10; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099; Y10T29/49101; Y10T29/49117; Y10T29/49124; Y10T29/4913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
THE METHOD OF MAKING A STRAIN GAGE COMPRISING THE STEPS OF CLEANING THE SURFACE OF A BASE ELEMENT; VACUUM DEPOSITING A THIN COATING OF ELECTROINSULATING MATERIAL UNIFORMLY ON SAID SURFACE; HEATING SAID BASE ELEMENT TO ABOUT 200*C.; VAPOR DEPOSITING A COATING OF ELECTROCONDUCTING ALLOY ON SAID INSULATING COATING; REDUCING THE TEMPERATURE OF THE BASE ELEMENT TO ROOM TEMPERATURE, APPLYING A PHOTOSENSITIVE RESIST TO SAID CONDUCTIVE COATING BEFORE AN APPRECIABLE AMOUNT OF OXIDE HAS FORMED THEREON; CONSTRUCTING A PATTERN FOR SAID GAGE AND MAKING A PHOTOGRAPHIC REPLICA THEREOF OF REDUCED SIZE; APPLYING AN IMAGE OF SAID REPLICA TO SAID RESIST; ETCHING SAID CONDUCTIVE COATING TO REMOVE THE EXCESS THEREOF AND LEAVE A STRAIN GAGE CONDUCTING ELEMENT OF THE DESIRED PATTERN ON SAID COATING OF INSULATING MATERIAL; AND ATTACHING A PAIR OF ELECTRICAL LEADS TO SAID ELECTROCONDUCTIVE COATING AT THE END PORTIONS THEREOF IN A MANNER SUCH THAT THE TRANSITION FROM SAID COATING TO SAID LEADS IS OF GRADUALLY INCREASING CROSS SECTIONAL AREA WHEREBY LOCAL STRESS CONCENTRATIONS ARE AVOIDED.
Claim 2
Independent Claim
167 words
THE METHOD OF MAKING A STRAIN GAGE COMPRISING THE STEPS OF CLEANING THE SURFACE OF A BASE ELEMENT; VACUUM DEPOSITING A THIN COATING OF ELECTROINSULATING MATERIAL UNIFORMLY ON SAID SURFACE; HEATING SAID BASE ELEMENT TO ABOUT 200*C.; VAPOR DEPOSITING A COATING OF ELECTROCONDUCTING ALLOY ON SAID INSULATING COATING; REDUCING THE TEMPERATURE OF THE BASE ELEMENT TO ROOM TEMPERATURE, APPLYING A PHOTOSENSITIVE RESIST TO SAID CONDUCTIVE COATING BEFORE AN APPRECIABLE AMOUNT OF OXIDE HAS FORMED THEREON; CONSTRUCTING A PATTERN FOR SAID GAGE AND MAKING A PHOTOGRAPHIC REPLICA THEREOF OF REDUCED SIZE; APPLYING AN IMAGE OF SAID REPLICA TO SAID RESIST; ETCHING SAID CONDUCTIVE COATING TO REMOVE THE EXCESS THEREOF AND LEAVE A STRAIN GAGE CONDUCTING ELEMENT OF THE DESIRED PATTERN ON SAID COATING OF INSULATING MATERIAL; AND ATTACHING A PAIR OF ELECTRICAL LEADS TO SAID ELECTROCONDUCTIVE COATING AT THE END PORTIONS THEREOF IN A MANNER SUCH THAT THE TRANSITION FROM SAID COATING TO SAID LEADS IS OF GRADUALLY INCREASING CROSS SECTIONAL AREA WHEREBY LOCAL STRESS CONCENTRATIONS ARE AVOIDED.
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) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |