US3730871A
Expired / Lapsed
US
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Apparatus for modifying a property of an article by diffusion
Assignee: AGC Glass Europe SA
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Filing: 1971-04-08
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Granted: 1973-05-01
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Expires: 1991-04-08
Abstract
Abstract IN PROCESSES WHEREIN AT LEAST ONE PROPERTY OF A GLASS, VITROCRYSTALLINE OR STONE MATERIAL IS IMPROVED BY THE DIFFUSION OF A SUBSTRATE INTO THE MATERIAL FROM A MEDIUM COMMUNICATING WITH THE MATERIAL, A METHOD AND APPARATUS FOR SUBSTANTIALLY IMPROVING THE DIFFUSION PROCESS BY PREVENTING NONUNIFORM CHANGES IN THE LIQUID MEDIUM ADJACENT THE SURFACE BEING TREATED DUE TO RANDOM CURRENTS IN THE REST OF THE MEDIUM. D R A W I N G
Inventors
- 👤 M Boffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:17
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
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 |