Patent US2647068A successfully refreshed from Google Patents.
US2647068A
Expired / Lapsed
US
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Process of treating vitreous materials
Assignee: Individual
•
Filing: 1948-03-16
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Granted: 1953-07-28
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Expires: 1968-03-16
Abstract
No abstract record available.
Inventors
- 👤 Bishop H Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:07
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/005; C03C17/00; C03C17/06; C03C21/002; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/251; C03C2218/00; C03C2218/10; C03C2218/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE PROCESS OF PRODUCING A MIRROR GLASS, COMPRISING SELECTING A GLASS HAVING A SODIUM CONTENT HIGHER THAN TEN PERCENT, BRINGING THE GLASS INTO PHYSICAL CONTACT WITH A SUBSTANCE CONTAINING SILVER NITRATE, HEATING THE GLASS TO A TEMPERATURE NOT EXCEEDING 3000* C. TO CAUSE A DIFFUSION OF THE SILVER NITRATE INTO THE GLASS, REMOVING THE EXCESS SUBSTANCE FROM THE GLASS, AND HEATING THE GLASS IN A REDUCING ATMOSPHERE OF ABOUT 600* C. TO PRODUCE A METALLIC SILVER TRANSPARENT STRATUM.
Claim 2
Dependent Claim
78 words
THE PROCESS OF PRODUCING A MIRROR GLASS, COMPRISING SELECTING A GLASS HAVING A SODIUM CONTENT HIGHER THAN TEN PERCENT, BRINGING THE GLASS INTO PHYSICAL CONTACT WITH A SUBSTANCE CONTAINING SILVER NITRATE, HEATING THE GLASS TO A TEMPERATURE NOT EXCEEDING 3000* C. TO CAUSE A DIFFUSION OF THE SILVER NITRATE INTO THE GLASS, REMOVING THE EXCESS SUBSTANCE FROM THE GLASS, AND HEATING THE GLASS IN A REDUCING ATMOSPHERE OF ABOUT 600* C. TO PRODUCE A METALLIC SILVER TRANSPARENT STRATUM.
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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) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |