Patent US2772515A successfully refreshed from Google Patents.
US2772515A
Expired / Lapsed
US
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Manufacture of hollow blocks of glass
Assignee: Pilkington Group Ltd
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Filing: 1952-06-13
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Granted: 1956-12-04
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Expires: 1972-06-13
Abstract
No abstract record available.
Inventors
- 👤 Dennett John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:34
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |