Some notes concerning the 4 registered designs in the opening post:
RD 42635, registered 12 April 1847 by W[illiam] Hayden] B[enjamin & J[onathan] Richardson, [Wordsley Glass Flintworks], Wordsley, Stourbridge. Class 3.
Shown on page 289 of 'Victorian Decorative Glass' by Mervyn Gulliver with the following description: "Design for a goblet decorated with a transfer printed picture of two figures carrying water containers". Interestingly, shown alongside is a drawing from the Richardson's RD 42634 of the same date, described as "Design for a water jug decorated with a transfer printed picture of two figures carrying large water containers".
RD 46523, registered 25 October 1847 by John Fell Christy & Co., Stangate Glass Works, Lambeth. Class 3.
http://collections.vam.ac.uk/item/O1087/vase-a-j-f/ shows an enamelled glass vase decorated in the Classical Greek style made ca. 1849 from the Stangate Glass Works. . "Companies such as that of J. F. Christy, whose speciality was painted decoration, looked to Greek 'red-figure' ceramics for ideas... Here J. F. Christy has chosen the simplest, handle-less shape but seeks to imitate the ware itself with black glass and painting in red enamel. The source has not been identified for the image of a man, not quite a satyr with a tail only, holding the bridle of a rearing ass. In 1849 the company was given an award by the Society of Arts for 'specimens of enamelled glass' ."
https://glassian.org/Prism/Patent/GB1841D742/drawing.html shows a Patent design registration for No. 742 · Improved Coal Plate · D IIa; Registered by John Fell Christy & Compy. of Stangate Glass Works, New Palace Road, Lambeth, in July, 1841. This appears to be a circular coal-hole cover {presumably of cast iron} with four circular glass inserts.
See also
http://blackcountryhistory.org/collections/getrecord/DMUSE_ST29/and from
https://www.glassmessages.com/index.php/topic,51033.msg289769.html#msg289769reply#76: 'Very little is known about the glassworks of J.F. Christy at Lambeth. Surviving examples attributable to his firm all date from the late 1840s, when he was producing painted opaline glass in the manner of Richardson's of Stourbridge, who were the leading producers of painted glass at this time. Like Richardson's, he produced ornamental wares inspired by Greek vases and by contemporary French opaline glass.' [see also RD 42635 above].
RD 49021, registered 17 January 1848 by John Davies, Stourbridge, Worcestershire. Class 3.
On 24th January 1846, John Davis leased Wheeley's Brettell Lane Glasshouses from William Seager Wheeley for twenty-one years. In 1850, Davis formed a parnership with William Greathead and Richard Green. Greathead had worked for William Gammon, glass manufacturer of Aston near Birmingham, then from 1836 to 1843 at Hawkes' Dudley Flint Glassworks, the last two years as a partner, then following the failure of Hawkes', a further seven years at Badger's Phoenix Glassworks. Richard Green had been involved in the glass trade since joining Hawkes in 1837 at the age of fifteen. John Davis dominated the partnership. He lived with his wife and family in Brettell Lane.
RD 54664, registered by Joseph Green, , Birmingham, Warwickshire, on 2 October 1848. Class 3.
No record in Grace's 1835 Birmingham Directory.