US3209689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of gun barrel wear
Assignee: Individual
•
Filing: 1957-11-04
•
Granted: 1965-10-05
•
Expires: 1977-11-04
Abstract
No abstract record available.
Inventors
- 👤 Mclennan Donald Elmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:44
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/24; Y; Y10; Y10S; Y10S102/00; Y10S102/704
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
AMMUNITION COMPRISING A PROJECTILE, AN EXPLOSIVE CHARGE FOR GENERATING PROPELLANT GASES TO PROPEL SAID PROJECTILE THROUGH THE BORE OF A GUN BARREL IN WHICH THE AMMUNITION IS ADAPTED TO BE USED AND A SLEEVE OF A COMPOSITION HAVING A FOAM-LIKE CELLULAR STRUCTURE PROVIDING AN ENLARGED SURFACE AREA ENCIRLING AT LEAST THE FORWARD PORTION OF SAID CHARGE FOR GENERATING A BOUNDARY LAYER OF COOL INERT GASES BETWEEN SAID PROPELLANT GASES AND THE SURFACE OF SAID BORE SUBSTANTIALLY IMMEDIATELY UPON THE BURNING OF SAID CHARGE AND LASTING FOR THE DURATION OF THE TRAVEL OF THE PROJECTILE THROUGH THE BORE, SAID LAMINAR BOUNDARY LAYER ACTING AT LEAST TO HALVE THE BORE SURFACE TEMPERATURE INCREMENT, SAID COMPOSITION COMPRISING AN ORGANIC HIGH POLYMER WHICH DECOMPOSES AT A TEMPERATURE BETWEEN 200* AND 300*F.
Claim 2
Dependent Claim
127 words
AMMUNITION COMPRISING A PROJECTILE, AN EXPLOSIVE CHARGE FOR GENERATING PROPELLANT GASES TO PROPEL SAID PROJECTILE THROUGH THE BORE OF A GUN BARREL IN WHICH THE AMMUNITION IS ADAPTED TO BE USED AND A SLEEVE OF A COMPOSITION HAVING A FOAM-LIKE CELLULAR STRUCTURE PROVIDING AN ENLARGED SURFACE AREA ENCIRLING AT LEAST THE FORWARD PORTION OF SAID CHARGE FOR GENERATING A BOUNDARY LAYER OF COOL INERT GASES BETWEEN SAID PROPELLANT GASES AND THE SURFACE OF SAID BORE SUBSTANTIALLY IMMEDIATELY UPON THE BURNING OF SAID CHARGE AND LASTING FOR THE DURATION OF THE TRAVEL OF THE PROJECTILE THROUGH THE BORE, SAID LAMINAR BOUNDARY LAYER ACTING AT LEAST TO HALVE THE BORE SURFACE TEMPERATURE INCREMENT, SAID COMPOSITION COMPRISING AN ORGANIC HIGH POLYMER WHICH DECOMPOSES AT A TEMPERATURE BETWEEN 200* AND 300*F.
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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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |