US3442172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gun barrel liner
Assignee: Fansteel Inc
•
Filing: 1959-03-13
•
Granted: 1969-05-06
•
Expires: 1979-03-13
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Wehrmann
- 👤 Roy H Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:31
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/02; F41A21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A LINER FOR A GUN BARREL AND TO BE SECURED WITHIN THE GUN BARREL, COMPRISING A SUBSTANTIALLY TUBULAR MEMBER OF COLUMBIUM BASE METAL HAVING A HARDNESS AS READ ON A ROCKWELL A SCALE SUBSTANTIALLY IN THE RANGE OF FROM ABOUT RA TO 40 TO ABOUT 70, SAID MEMBER OF COLUMBIUM BASE METAL BEING FORMED OF AN ALLOY WITH OXYGEN, THE OXYGEN ADDED TO THE COLUMBIUM BASE METAL IN THE ALLOY BEING PRESENT IN THE RANGE OF FROM ABOUT 0.15 PERCENT BY WEIGHT TO ABOUT 0.55 PERCENT BY WEIGHT.
Claim 2
Dependent Claim
88 words
A LINER FOR A GUN BARREL AND TO BE SECURED WITHIN THE GUN BARREL, COMPRISING A SUBSTANTIALLY TUBULAR MEMBER OF COLUMBIUM BASE METAL HAVING A HARDNESS AS READ ON A ROCKWELL A SCALE SUBSTANTIALLY IN THE RANGE OF FROM ABOUT RA TO 40 TO ABOUT 70, SAID MEMBER OF COLUMBIUM BASE METAL BEING FORMED OF AN ALLOY WITH OXYGEN, THE OXYGEN ADDED TO THE COLUMBIUM BASE METAL IN THE ALLOY BEING PRESENT IN THE RANGE OF FROM ABOUT 0.15 PERCENT BY WEIGHT TO ABOUT 0.55 PERCENT BY WEIGHT.
References Cited (Backward Citations)
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US2373405A
Cited
US2609631A
Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |