US2577937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for grinding flat glass on both faces simultaneously
Assignee: Pilkington Group Ltd
•
Filing: 1949-08-26
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Granted: 1951-12-11
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Expires: 1969-08-26
Abstract
No abstract record available.
Inventors
- 👤 Waldron Frederic Barnes
- 👤 Griffin James Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/20; B24B7/22; B24B7/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2270362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |