US2178504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass polishing apparatus
Assignee: Pilkington Group Ltd
•
Filing: 1939-03-23
•
Granted: 1939-10-31
•
Expires: 1959-03-23
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 23:31
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/06; C22B23/065; B; B24; B24B; B24B57/00; B24B7/00; B24B7/20; B24B7/22; B24B7/24; B24B7/242; Y; Y10; Y10S; Y10S29/00; Y10S29/068
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1942-10-30 | 1943-05-01 | 1943-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-30 | 1947-05-01 | 1947-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-30 | 1951-05-01 | 1951-10-31 | $7700.00 | Window Closed / Lapsed |