Patent US3294561A successfully refreshed from Google Patents.
US3294561A
Expired / Lapsed
US
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Bronze-smoke segment glass
Assignee: PPG Industries Inc
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Filing: 1965-03-05
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Granted: 1966-12-27
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Expires: 1985-03-05
Abstract
No abstract record available.
Inventors
- 👤 James E Duncan
- 👤 Joseph E Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:09
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/093; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A BRONZE-SMOKE GLASS CONSISTING OF ESSENTIALLY THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT 45 TO 50 PERCENT SIO2 18 TO 30 PERCENT BAO, 5 TO 9 PERCENT NA2O 1 TO 7 PERCENT K2O, 3 TO 6 PERCENT B2O3 3 TO 7 PERCENT CAO, 1 TO 5 PERCENT TIO2, 1 TO 4 PERCENT ZRO2, 0 TO 6 PERCENT ZNO, 0.0 TO 2 PERCENT SB2O5, 1 TO 4 PERCENT A12O3, 001 TO 008 PERCENT COO, AND 1 TO 5 PERCENT NIO, AND WHICH EXHIBITS A SOFTENING POINT BETWEEN 1260 AND 1310*F., AN INDEX OF REFRACTION OF BETWEEN 1.587 AND 1.593, AND A TOTAL LUMINOUS TRANSMITTANCE OF BETWEEN 23 AND 27 PERCENT FOR A THICKNESS OF 2 MILLIMETERS.
Claim 2
Dependent Claim
115 words
A BRONZE-SMOKE GLASS CONSISTING OF ESSENTIALLY THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT 45 TO 50 PERCENT SIO2 18 TO 30 PERCENT BAO, 5 TO 9 PERCENT NA2O 1 TO 7 PERCENT K2O, 3 TO 6 PERCENT B2O3 3 TO 7 PERCENT CAO, 1 TO 5 PERCENT TIO2, 1 TO 4 PERCENT ZRO2, 0 TO 6 PERCENT ZNO, 0.0 TO 2 PERCENT SB2O5, 1 TO 4 PERCENT A12O3, 001 TO 008 PERCENT COO, AND 1 TO 5 PERCENT NIO, AND WHICH EXHIBITS A SOFTENING POINT BETWEEN 1260 AND 1310*F., AN INDEX OF REFRACTION OF BETWEEN 1.587 AND 1.593, AND A TOTAL LUMINOUS TRANSMITTANCE OF BETWEEN 23 AND 27 PERCENT FOR A THICKNESS OF 2 MILLIMETERS.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |