Patent US2881059A successfully refreshed from Google Patents.
US2881059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical taper milling process
Assignee: North American Aviation Corp
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Filing: 1956-03-02
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Granted: 1959-04-07
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Expires: 1976-03-02
Abstract
No abstract record available.
Inventors
- 👤 Russell W Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:09
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C23F1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A PROCESS FOR CHEMICALLY TAPER MILLING A WORKPIECE TO GIVE CONSTANT THICKNESSES ALONG STRAIGHT-LINE PLANES GENERATING FROM A COMMON POINT COMPRISING IMMERSING AND THEN EMERSING A POINT A ON SAID WORKPIECE IN AND OUT OF AN ETCHING SOLUTION A DESIRED NUMBER OF TIMES AT A RATE R1, AND CONCURRENTLY IMMERSING AND THEN EMERSING FOR SAID NUMBER OF TIMES ANOTHER POINT B ON SAID WORKPIECE, LATERALLY SPACED FROM SAID POINT A, IN AND OUT OF SAID ETCHING SOLUTION AT A RATE R2 WHICH IS DIFFERENT FROM THE RATE R1.
Claim 2
Dependent Claim
88 words
A PROCESS FOR CHEMICALLY TAPER MILLING A WORKPIECE TO GIVE CONSTANT THICKNESSES ALONG STRAIGHT-LINE PLANES GENERATING FROM A COMMON POINT COMPRISING IMMERSING AND THEN EMERSING A POINT A ON SAID WORKPIECE IN AND OUT OF AN ETCHING SOLUTION A DESIRED NUMBER OF TIMES AT A RATE R1, AND CONCURRENTLY IMMERSING AND THEN EMERSING FOR SAID NUMBER OF TIMES ANOTHER POINT B ON SAID WORKPIECE, LATERALLY SPACED FROM SAID POINT A, IN AND OUT OF SAID ETCHING SOLUTION AT A RATE R2 WHICH IS DIFFERENT FROM THE RATE R1.
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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |