Patent US3881840A successfully refreshed from Google Patents.
Patent US3305338A successfully refreshed from Google Patents.
US3305338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing flat glass of different thicknesses
Assignee: Pilkington Group Ltd
•
Filing: 1963-04-01
•
Granted: 1967-02-21
•
Expires: 1983-04-01
Abstract
No abstract record available.
Inventors
- 👤 Robinson Albert Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:02
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B18/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |