US2838809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple glazed units
Assignee: PPG Industries Inc
•
Filing: 1954-01-29
•
Granted: 1958-06-17
•
Expires: 1974-01-29
Abstract
No abstract record available.
Inventors
- 👤 Mario N Zeolla
- 👤 William S Bobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:39
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/66; E06B3/677; E06B3/663; E06B3/66309; E06B3/66342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1889075A
Cited
GB515085A
Cited
US2306327A
Cited
US2597097A
Cited
US2525717A
Cited
US2618819A
Cited
US2684266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |