US2850828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum alloy gun barrel with a lubricating film
Assignee: Individual
•
Filing: 1953-03-24
•
Granted: 1958-09-09
•
Expires: 1973-03-24
Abstract
No abstract record available.
Inventors
- 👤 George C Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:25
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/24; F41A21/02; F41A21/04; F41A21/12; F41A21/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A FIREARM BARREL MADE OF LIGHT WEIGHT, HIGH THERMAL CONDUCTIVITY ALUMINUM ALLOY HAVING UPON AT LEAST ITS BORE SURFACE, A LAYER OF POROUS MATERIAL, AND A SUBSTANTIALLY PERMANENT DRY BAKED LUBRICATING FILM UPON SAID POROUS LAYER WHICH EXTENDS INTO THE PORES OF SAID POROUS LAYER, SAID DRY BAKED LUBRICATING FILM COMPRISING APPROXIMATELY 225 PARTS BY WEIGHT OF BINDER, APPROXIMATELY 225 PARTS BY WEIGHT OF LOMYBDENUM DISULFIDE, AND APPROXIMATELY 25 PARTS BY WEIGHT OF GRAPHITE, SAID FILM HAVING A THICKNESS OF FROM 1/8 TO 1/2 MIL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |