Patent US3981111A successfully refreshed from Google Patents.
US3981111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating unit
Assignee: Individual
•
Filing: 1975-03-03
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Granted: 1976-09-21
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Expires: 1995-03-03
Abstract
Abstract There is provided an insulating unit, such as a double-glazed sealed window unit, comprising at least two spaced-apart transparent plates. The plates are sealingly joined together around their peripheral edges by sealing means, thereby to form a sealed chamber in which there is enclosed a medium such as gas, air or liquid. Means are provided to permit a pivoting movement of at least one of the transparent plates towards and away from an opposing plate, thereby to increase or decrease the volume of the enclosed medium in response to changes in the temperature of the transparent plates.
Inventors
- 👤 Nils Ture Lennart Berthagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:23
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/66; E06B3/663; E06B3/66309; E06B3/67; E06B3/6715; E06B3/677; E06B2003/6639
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
In an insulating unit of the kind having at least two mutually opposing transparent plates joined together along their peripheral edge portions by means of a substantially gas-tight and liquid-light sealing means, said sealing means, together with said transparent plates, defining a closed, gas-tight and liquid-tight chamber and permitting movement between the plates, the improvement comprising means attached to at least one plate for allowing said one plate to pivot automatically with respect to said other plate around a fixed axis at its lower edge in response to changes in pressure in said closed chamber.
Claim 2
Dependent Claim
95 words
In an insulating unit of the kind having at least two mutually opposing transparent plates joined together along their peripheral edge portions by means of a substantially gas-tight and liquid-light sealing means, said sealing means, together with said transparent plates, defining a closed, gas-tight and liquid-tight chamber and permitting movement between the plates, the improvement comprising means attached to at least one plate for allowing said one plate to pivot automatically with respect to said other plate around a fixed axis at its lower edge in response to changes in pressure in said closed chamber.
Claim 3
Dependent Claim
22 words
An insulating unit as claimed in claim 1, wherein additional means are provided to mount said other plate in a fixed position.
Claim 4
Dependent Claim
62 words
An insulating unit as claimed in claim 1, further comprising a third transparent plate arranged in a spaced relationship with one of said two plates which are pivotably movable relative to each other, said third transparent plate together with said one plate defining a space which is open at least at the bottom and top thereof to permit air to circulate therethrough.
Claim 5
Dependent Claim
23 words
An insulating unit as claimed in claim 3, further comprising an air heating element located in the bottom open end of said space.
Claim 6
Dependent Claim
30 words
An insulating unit as claimed in claim 1, wherein the bottom edge of said one plate engages at least one support body arranged to form a guide for said plate.
Claim 7
Dependent Claim
22 words
An insulating unit as claimed in claim 5, wherein said support body is stationarily arranged and is made of a flexible material.
Claim 8
Dependent Claim
22 words
An insulating unit as claimed in claim 3, wherein the third plane is stationarily mounted at a distance from a pivotable plate.
Claim 9
Dependent Claim
17 words
An insulating unit as claimed in claim 4, wherein the air-heating element is arranged between the plates.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |