US2724918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Taper chemical milling apparatus
Assignee: North American Aviation Corp
•
Filing: 1954-10-04
•
Granted: 1955-11-29
•
Expires: 1974-10-04
Abstract
No abstract record available.
Inventors
- 👤 Eugene L Triman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C23F1/04; C23F1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
APPARATUS FOR TAPER MILLING COMPRISING AN ETCHANT TANK; ETCHANT CONDUCTIVITY MEASURING MEANS, ETCHANT TEMPERATURE MEASURING MEANS, MEANS PROVIDING A PREDETERMINED VARYING EXPOSED OF THE WORKPIECE TO ETCHING ACTION IN SAID TANK, AND MEANS RESPONSIVE TO VARIATIONS IN ETCHANT CONDUCTIVITY AND ETCHANT TEMPERATURE FOR CHANGING THE AMOUNT OF SAID EXPOSURE.
Claim 2
Dependent Claim
49 words
APPARATUS FOR TAPER MILLING COMPRISING AN ETCHANT TANK; ETCHANT CONDUCTIVITY MEASURING MEANS, ETCHANT TEMPERATURE MEASURING MEANS, MEANS PROVIDING A PREDETERMINED VARYING EXPOSED OF THE WORKPIECE TO ETCHING ACTION IN SAID TANK, AND MEANS RESPONSIVE TO VARIATIONS IN ETCHANT CONDUCTIVITY AND ETCHANT TEMPERATURE FOR CHANGING THE AMOUNT OF SAID EXPOSURE.
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) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |