US3147169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for determining thickness during chemical milling
Assignee: Grumman Corp
•
Filing: 1961-02-23
•
Granted: 1964-09-01
•
Expires: 1981-02-23
Abstract
No abstract record available.
Inventors
- 👤 Charles P Albertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:58
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2437; G01N29/2443; G01B; G01B17/00; G01B17/02; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02854; G01N2291/04; G01N2291/042; G01N2291/0421
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
IN APPARATUS FOR DETERMINING THE THICKNESS OF A WORKPIECE DURING CHEMICAL ETCHING BY IMMERSION, A TRANSDUCER, A CUP-SHAPED MEMBER, THE OPEN END OF SAID MEMBER BEING IN CONTACT WITH THE FACE OF THE WORKPIECE TO THEREBY DEFINE WITH THE WORKPIECE A CHAMBER WITHIN WHICH SAID TRANSDUCER IS CONTAINED, A GROOVE PROVIDED ON THE INNER SRUFACE OF SAID CUP-SHAPED MEMBER ADJACENT THE OPEN END THEREOF, AN ANNULAR ELECTRODE CONTAINED WITHIN SAID GROOVE,
Claim 2
Dependent Claim
71 words
IN APPARATUS FOR DETERMINING THE THICKNESS OF A WORKPIECE DURING CHEMICAL ETCHING BY IMMERSION, A TRANSDUCER, A CUP-SHAPED MEMBER, THE OPEN END OF SAID MEMBER BEING IN CONTACT WITH THE FACE OF THE WORKPIECE TO THEREBY DEFINE WITH THE WORKPIECE A CHAMBER WITHIN WHICH SAID TRANSDUCER IS CONTAINED, A GROOVE PROVIDED ON THE INNER SRUFACE OF SAID CUP-SHAPED MEMBER ADJACENT THE OPEN END THEREOF, AN ANNULAR ELECTRODE CONTAINED WITHIN SAID GROOVE,
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |