Patent US4479988A successfully refreshed from Google Patents.
US4479988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spacer bar for double glazing
Assignee: Reddiplex Ltd
•
Filing: 1982-06-28
•
Granted: 1984-10-30
•
Expires: 2002-06-28
Abstract
Abstract A spacer bar for double glazing is made as a hollow extrusion of polycarbonate, preferably incorporating about 20% of glass fibre reinforcement.
Inventors
- 👤 Charles D. Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:02
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/66; E06B3/663; E06B3/66309; E06B3/66314; E06B3/66319; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
A spacer bar for double glazing comprising a hollow extrusion of polycarbonate material incorporating reinforcing filler of glass fibre.
Claim 2
Dependent Claim
19 words
A spacer bar for double glazing comprising a hollow extrusion of polycarbonate material incorporating reinforcing filler of glass fibre.
Claim 3
Dependent Claim
21 words
A spacer bar according to claim 1 in which the filler comprises between 10 and 40% by weight of glass fibre.
Claim 4
Dependent Claim
19 words
A spacer bar according to claim 2 in which the filler comprises substantially 20% by weight of glass fibre.
Claim 5
Dependent Claim
12 words
A double glazing unit employing a spacer bar according to claim 1.
References Cited (Backward Citations)
US3791910A
Cited
US3758996A
Cited
US4204015A
Cited
US4305982A
Cited
US4335166A
Cited
US4341835A
Cited
US4433016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |