Patent US2877516A successfully refreshed from Google Patents.
US2877516A
Expired / Lapsed
US
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Multiple glazed unit
Assignee: PPG Industries Inc
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Filing: 1958-01-17
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Granted: 1959-03-17
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Expires: 1978-01-17
Abstract
No abstract record available.
Inventors
- 👤 William S Bobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:14
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/24; E06B9/26; E06B9/264; E06B3/00; E06B3/66; E06B3/67; E06B3/6715
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2270425A
Cited
US2545906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |