Patent US3730827A successfully refreshed from Google Patents.
US3730827A
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US
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Boron carbide ballistic armor modified with copper
Assignee: Norton Research Corp Canada Ltd
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Filing: 1971-11-22
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Granted: 1973-05-01
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Expires: 1991-11-22
Abstract
Abstract COMPOSITE CERAMIC ARMOR WITH IMPROVED BALLISTIC PROPERTIES. BASIC BORON CARBIDE ARMOR IS IMPROVED BY THE DDITION TO THE BORON CARBIDE OF CERTAIN WUANTITIES OF COPPER OR COPPER ADMIXED WITH CALCIUM BORIDE, TITANIUM, MANGANESE, BORON OR CHROMIUM. IMPROVED BALLISITCS ALSO RESULT FROM A MULTILAYER CERAMIC FACE PLATE WHEREIN ONE OR MORE LAYERS OF THE ABOVE MODIFIED BORON CARBIDE IS COMBINED WITH A LAYER OF BORON CARBIDE TO FORM AN INTEGRAL CERAMIC FACE PLATE.
Inventors
- 👤 B Matchen
- 👤 D Robertson
- 👤 J Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:46
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B32; B32B; B32B18/00; C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/563; C04B35/622; C04B35/64; C04B35/645; C04B37/00; C04B37/02; C04B37/021; F; F41; F41H; F41H5/00; F41H5/02; F41H5/04; F41H5/0414; F41H5/0421; F41H5/0428; F41H5/0435; B32B2264/00; B32B2264/10; B32B2264/104; B32B2571/00; B32B2571/02; C04B2235/00; C04B2235/65; C04B2235/66; C04B2235/668; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/363; C04B2237/40; C04B2237/403; C04B2237/404; C04B2237/407; C04B2237/50; C04B2237/56; C04B2237/568; C04B2237/70; C04B2237/702
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |