Patent US3690856A successfully refreshed from Google Patents.
US3690856A
Expired / Lapsed
US
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Welded double glazing units
Assignee: Pilkington Group Ltd
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Filing: 1970-06-05
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Granted: 1972-09-12
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Expires: 1990-06-05
Abstract
Abstract Vacuum holding apparatus for engaging the upper surface of a sheet of glass in the manufacture of an allglass welded double glazing unit, includes a chuck platen and a sheet-holding platen connected by at least two bolt connections, each bolt connection including spring means resiliently drawing the platens together.
Inventors
- 👤 John Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:14
CPC Classifications
B; B65; B65G; B65G49/00; B65G49/05; B65G49/06; B65G49/061; C; C03; C03B; C03B23/00; C03B23/20; C03B23/24; C03B23/245; B65G2249/00; B65G2249/04; B65G2249/045
Claims Analysis
Total Claims: 0
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |