Patent US2581639A successfully refreshed from Google Patents.
US2581639A
Expired / Lapsed
US
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Glass to metal seal and glass composition
Assignee: PPG Industries Inc
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Filing: 1950-12-01
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Granted: 1952-01-08
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Expires: 1970-12-01
Abstract
No abstract record available.
Inventors
- 👤 Duncan James Earle
- 👤 John J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:15
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/02; B; B63; B63B; B63B1/00; B63B1/02; B63B1/10; B63B1/107; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/083; C03C3/085; C03C3/087; C03C3/089; C03C3/091; C03C3/11; C03C8/00; C03C8/24; Y; Y10; Y10S; Y10S228/00; Y10S228/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A GLASS TO METAL SEAL BETWEEN AN ALLOY CONSISTING ESSENTIALLY OF 83 PERCENT BY WEIGHT OF IRON AND 17 PERCENT BY WEIGHT OF CHROMIUM AND A GLASS HAVING AN ULTIMATE ANALYTICAL COMPOSITION OF:
Claim 2
Dependent Claim
33 words
A GLASS TO METAL SEAL BETWEEN AN ALLOY CONSISTING ESSENTIALLY OF 83 PERCENT BY WEIGHT OF IRON AND 17 PERCENT BY WEIGHT OF CHROMIUM AND A GLASS HAVING AN ULTIMATE ANALYTICAL COMPOSITION OF:
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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |